Intimate Days with My Tsundere Sister

by hakubox

Uncensor patch Windows
Versionv1.0.3
EngineRPGM
Released2025-12-17
Updated2026-04-09
LanguageEnglish, Japanese, Chinese, Korean

She and I are left utterly alone in our quiet house. In the dead silence of the residence, a sweet, dangerous tension begins to thicken the air. She, usually so cold to me, reveals a completely different side of herself when it's just the two of us at night. Her lovely sleeping form, wrapped in loose pajamas... The soft swell of her chest and smooth, white skin peeking out--the sight makes my groin ache and my pulse hammer in my throat. With every one of her defenseless, sweet breaths, the forbidden desires I'd long suppressed began to throb with a raw, desperate need. Spoiler "I can't... I won't hold back anymore..." My uncontrollable lust reaches its boiling point, and I finally resolve to break the ultimate taboo -- to defile her and make her completely, utterly mine. But this summer, it seems it's not just her; other tempting women are aiming their own lewd designs on me. A one-month limited cohabitation -- can I possibly contain my pounding erection as I drown in depravity? The clock is ticking--only one month. The story of a forbidden life of secret passion begins now...

v1.0.3 1、Fixed an issue where the game failed to launch in some cases. 2、Fixed a crash occurring after clearing the game on Day 30. 3、Fixed some Japanese and English translation errors. 4、Kissing during sleeping sex will now reduce Wakefulness. 5、The entry requirement for the Construction Site has been changed; it is now accessible after Day 12. 6、Daily diary entries will no longer be duplicated. 7、Error messages will no longer appear if a video fails to load. v1.0.2 1、Fixed some CG errors in Chinatsu's route. 2、Fixed missing translations and line break issues for certain languages (mainly English and Korean). 3、Fixed a bug in Chinatsu's 100-Affinity CG where the model would revert to the small-breasted version during the climax scene if the "Busty" option was enabled. 4、Improved the H-scene that occurs after losing an enemy encounter in the Forest Adventure. 5、Fixed a bug that caused errors during H-animations in the Forest Adventure. 6、Fixed an issue where an incorrect background was displayed during Chinatsu's Park Date Event 2. 7、Fixed an issue where the All-Purpose Ticket was not working. 8、Fixed a sprite-switching error after reaching the Harem Ending. 9、Fixed an error that occurred when switching glasses configurations after the Harem Ending. v1.0.1 Bug fixes have been implemented. v1.0.0 Initial Release
Shadowplayer40 2026-02-25
Not sure what everyone is upset about. The animations are great, the gameplay is. Well, it's a porn game? The game isn't bad. People rate ai slop higher, so I think this needs a break. Like I said. It's porn. If you're here for porn, then this game has amazing animations and that good ol' taboo twist I like
Daddy-Oniiichan 2026-02-19
I'm being generous with this mediocre rating only because this game sticks to the core premise: Cum belongs inside the pussy, while condoms and "safe sex" lessons have no place in H-games. It's not sex if you don't cum inside, and the developer understood at least this much. That said... it really is pretty mid. They use the inseki excuse, which is lame, and the only repeatable consensual sex scene uses the same animation as the night crawling... the sister is simply wide awake, laying motionless as you pound away. And it also requires a sanity of 70 or less, which only makes sense in the first few days of the game, before her first sex scene. It does have some hot scenes, such as the bathroom sex scene that unlocks fairly early, but they're one-time-only, which sucks. Having multiple heroines is fine, but their scenes, too, are once-only. Game would have been a lot better if they had focused more on the daily sex loop, which definitely shouldn't require a sanity of 70 or less once you've already deflowered her in the bathtub.
ade001 2026-02-04
This game... leaves me in mixed feelings. It has a fairly janky design overall, progression is all over the place, there's overlapping voices during h scenes, stamina and money economy on top of time limit is questionable 3 characters that aren't Kana feel like adds loosing to her by a disproportionately huge margin (in terms of accessible content - there's really almost nothing you can do with the "adds" except talk to them (h happens at affection thresholds and that's it, there's also a couple of dates you can go on with them, I wish Elu had more content coz I sort of enjoyed her character ). With all that being said there are a couple of genuinely fun scenes, that fans of the genre may appreciate. Most of the game loop is just grinding "grope my sister's breasts enough times to get them stat thresholds" (which is nothing new, but gives this odd vibe that protag feels interchangeable with a vibrator)
east1771 2026-01-07
Not worth playing. It's a complete waste of time. Even if you're tempted by the cover, the actual animation is just a repeat of two CG variations. It's the most embarrassing game I've ever played. If you have an infinite amount of free time, go for it Sorry for the google translation
KyoN007 2025-12-08
I like the UI, I like the genre, the sistertype and their interactions. Side charakters as NPC in shops are great too - but the game is lacking one fundamental in an h game - the h scenes. The h-scenes are just statics with minimal movement - if it had good animations here, it would have been a 4* game for me.
Bxhero 2025-12-01
The people below or above me are far more lenient than me if they vote more than 3 stars. This game has so many bugs and the grind is horrible. I had the shop crash on me multiple times to the point I just cheated the values and got all the items, then CG/pictures just did not appear, broke, stayed or just showed the wrong character. Just rip the animations and cgs if you want. I was just disgusted that I wasted 30mins on this to bother.
Madmac88 2025-11-26
This is an extremely rough experience. Bugs alore, inconsistent art, incoherent story, voice acting that makes you think its ai made, unnatural progression, at first you can barely touch and then suddenly a few days later you fuck her in the bathroom, the writing is horrible, the music is also pretty bad. Some scenes actually do have certain quality to them, I also appreciate a slg with a little "sister" where she has some big boobs. The touching scenes are also pretty nice.
VictorDoUrden 2025-11-20
tsundere are and always have been the worst most cringe dere. That could be tolerated but the offensive disgusting step shit is a line too far. Just aheadsup if youare going to beplaying thishappensalot which is stillbetterthen text just goingoutsidethe box Dunno about later but first sleep go attempt is no exaggeration I can go make some fucking tea and take a piss and THEN come back to my pc before the alert status empties.
mortis_interessant 2025-11-20
What this game does good is its relatively high production values as is standard with Chinese RPGM. It makes great use of Spine2d and Live2d animations, but the sexual scenes that are not the night crawling portion are static images. Every other heroine aside from your Tsundere (step-)sister only have two scenes one happening at 40-50 and another at 100. There is one lame harem ending. I'm not particularly into pregnancy, but if you are, no this game doesn't have it. The game has a horrible grinding curve and a time limit of 30 days. I have no doubt that this probably gets easier along the way including managing stamina, but a hard limit on days usually indicates getting "blueballed" just when the run actually gets better. The translations for English are horrible and needs a lot of proofreading or a better script parsed through by AI. Names are fortunately consistent but wordwrapping is off, some names are unspaced and horrible word choice abounds, to say nothing of the native Chinese script that shows up when the line is untranslated. The game is somewhat suspicious in that it can load a webpage to the author's own sites; this could be used as a payload to launch malicious attacks. All in all, I suggest skipping this. The girl is tsundere anyway and thus annoying.
eminemball 2025-11-19
This game has the content to be really good, but it lacks a lot of polish. The story has an alright premise, but is ruined by bugs. The interactive sex events have consistent bugs, the backgrounds didn't match with the time, incorrect CGs, and many crashes. Sex scenes are triggered when they're not supposed to be and the story itself is too short to make sense. You will basically go from light groping to sex within a few in-game days. While the bugs and story did sour the experience, I think the art and animations are worth seeing.
PDP19 2025-11-19
Quick review, because despite its content the game doesnt really have that much going for it. Storyline is kinda fucked. You play as a hopeless loser onii-chan with one of the brattiest, most mindfucked little STEP-sister (as though the game couldnt make this any clearer) who practically abuses her bro on a daily basis but is secretly in love with him. Obviously. If this isnt enough imoutos for you, the game also contrives several non-related sisters for you to fuck around with, or rather the other way around, but these are not central to the premise and can be easily ignored. Gameplay is fairly standard. You work to get cash, and spend all the other times not working raising affection levels and managing stamina. A word of advice is to immediately start working on increasing your max stam because everything, including the H, rely on it. There are annoying minigames to suffer through, but I got by without really much trouble. As long as you have been working on that max stam its fairly inoffensive, but I cannot for the life of me understand why these need to exist. As for H gameplay, there are VN sections where you just spacebar until she cums, and there are more interactive scenes where youre invited to mouseclick until she cums. I find the interactive scenes unimpressive as lil sis barely puts out any emotions in any of them. At least the VN scenes are fine, as long as the storyline doenst piss you off. There is VA and slight animations on what seem like live2d. Just a short comment on the artwork design because I find the idea of a alleged schoolgirl wearing a belt for a skirt as amusing as it is idiotic. Shes apparently not wearing a bra because the straps wouldve needed to be 2 feet long given the continental size of her puppies. In CONCLUSION... What can I say? Its just another siscon cohabitation game that clearly took liberties with imouto monochrome, all the way down to the sleep fuck mechanic, but much like a student vigorously copying his friends' homework before school starts 5 minutes later, the work looks impressive but hollow. To put simply, the game has zero emotional value because its too busy staring at lil sis' massive watermelon jugs. Lil sis wavers so much between love and abuse that theres no consistency to her behavior, and the sex when offered kinda just happen, like a flip of a switch. Life with a flirty step-sis has practically the same premise, practically the same bratty sis (more tease than abusive) personality, is more barebones by comparison, but because they executed the emotional value better it stands as the superior game. So can I recommend this? Well, only if you really need a sis that will dress you down at every opportunity, in which case this game is perfectly designed for you. Otherwise, theres simply better siscon cohabitation games available.
whatmi 2025-11-19
After eternity of mind-breaking grind game asked me if i don't just wanna unloack all CGs, bringing the score up Pros: competent game (for me game had 0 bugs or crashes in v1.0.0 and im not that impressed to lie about it) RPGM without this stupid walkies completed game with no nonsense Decent performance and fast loading of scenes girls are relatively hot and you can romance other people, not just your sister adventure mini-game is nice change of pace Cons: game keep asking you if you wanna be a creep "prank sleeping sister" or watch her take a bath, you can't set NO as default no beach, no swimsuits, skin tanning, volleyball or nice date spot Grindy hell of void nothing Taking characters to date provide no benefits in affection or anything you not just grind money, but also characters relations and sister things you also need to manage sanity... Time fly fast in-game, but slow while playing it xD Sister have like 15 CGs where most other characters get lucky to have 2 Summary: this game is whatever try if you don't mind the grind or like playing as pervert/incest
AlliTheAlligator 2025-11-18
Game has perfect art style that comes along with animation. Scenes are enjoyable and erotic A few problems occurred to me however 1. Translation isn't the best 2. Minigames are really sensitive. I know it's supposed to be like that, but if I make even one little mistake or move my mouse just a little on something I shouldn't touch, the minigame automatically ends. It sucks 3. The game story is kind of all over the place 4. Game has plenty of bugs and crashes Otherwise I would recommend downloading the game and even supporting creator

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