The Sin Within is an adult Ren'Py adventure and dating sim by CigarRex, presented with 3D CG images and animated scenes. You play Nick Harada, a suburban student whose ordinary life is changed when he becomes tied to Lust and the supernatural. As he learns to live as a devil, he explores his desires, seeks out the remaining deadly sins, and works to corrupt the women around him.
Development is ongoing, and the current build is v0.5.2, released September 8, 2026 for Windows, Linux, and Mac. It is English and uncensored. This update adds Gardening Duty II, thousands of new renders and animations, much new dialogue, and many new scenes. It expands relationships with Chell and Carol, gives more material for Rose, Claire, Beatrice, Zoey, and Karin, and introduces the Callahan Household and Carol's home. It also adds park content, special Greed dialogue, a Katherine Gyaru Frenzy featurette, a major July 4 scene, plus bug fixes and progression corrections.
Developer's description
THE SIN WITHIN is the story of a boy exploring his mundane world under a new light...
Join
Nick Harada
, the kind student from the suburbs, in his
journey
to uncover the true pleasures of
Lust,
being led by an unlikely fate with the
supernatural!
Free the
desires
of
ALL
the women he knows, and the world will become a
better place! (maybe?)
Spoiler
Posessed by the
Deadly Sin of Lust
, Nick will have to find his footing as a
Devil,
navigating through his new
'options'
while he searches for the other 6 Deadly Sins!
(He will have sex, if you didn't catch it!!!!!)
v0.5.2 (2026-09-08):
Gardening Duty II !
Gardening Duty
+ 3.000
new renders
(with
+365 animations!!
)
+ 5.000
lines of dialogue!
+ 32
NEW SCENES!!
+ FURTHER YOUR RELATIONSHIPS WITH CHELL AND CAROL!
+ Some more scenes with Rose, Claire, Beatrice, Zoey and Karin...!
+ 2 New Locations: Callahan Household; Carol's Home
(Or, Bedroom...)
!
+ Finally added stuff to The Park!
+
Added special dialogue with Greed regarding your recent discoveries... Don't miss it.
+ 2 NEW EXTRAS:
- A small featurette with Katherine in the Gyaru Frenzy storyline!
- THE MOST GARGANTUAN, OBSCENE AND INCREDIBLE SCENE IN THE GAME:
THE 4TH OF JULY SPECIAL!
WITH OVER 800 RENDERS BY ITSELF!!
+
Fixed lots of bugs!!
+
Fixed some progression oversights and missing pieces.
+ Fixed some typos, but definitely not all
Please keep the reports coming!
Totalling...
~ 23.000 renders
~ 51.000 lines of dialogue
~ 1.500 animations
v0.5.1 (2026-04-08):
Gardening Duty I !
Gardening Duty
+ 2.270
new renders
(with
+282 animations!!
)
+ 4.000
lines of dialogue!
+ 23
NEW, INCREDIBLY SPICY SCENES!!
+ BRING MS. CLAIRE TO LUST LVL 2 - THE FIRST OF MANY!
+
Invite many other girls to your questionable photoshoot sessions at School...
+ 1 New Location: Ms. Claire's Apartment!
+ 1 New Location: The Park! (but there's nothing there yet... Soon TM)
+ Overhauled the Notes App
: Now features an extensive Quest tab, guiding you through whatever storylines require a bit more attention step-by-step.
+
Overhauled the Gallery App
: Each Gallery section now features a progress bar and a scene counter.
+
Overhauled the Help App
: Now contains several topics neatly organized to help you out.
I told you, it would get prettier one day!
+ Added Keybinds!
Check the
Help App
for the full list.
These will make your life much easier!
+
Fixed some eldritch bugs and embarrassing typos.
Totalling...
~ 20.000 renders
~ 46.000 lines of dialogue
v0.5.0 (2025-08-08):
Back to School!
Brick-By-Brick
+ 3.375
new renders
(with
+142 animations!!
)
+ 8.000
lines of dialogue!
+ 74
NEW SCENES!! (plus countless other smaller interactions...)
+ 3
new characters!
(Katherine, Beth, Nico)
+ 1
new
SUPER-LOCATION
The School!
The School is divided into 6 new locations, 30 rooms total!
+ 11
brand-new events!
+ Implemented the
Favor System
Warm yourself up to hard-headed girls first!
+ Implemented the
Instance System
Allows for characters to be in different locations depending on your current Instance.
+ Added
checkmarks to all interactions in-game
, indicating the scene's
completion status.
+ Added
checkmarks
to indicate if a scene
skips time.
+ Added a button to
skip the time
in the
Contacts App.
+ Added a short questline that unlocks
Teleporting to characters
from the
Contacts App.
+
Fixed some eldritch bugs
Totalling...
~ 18.500 renders
~ 42.000 lines of dialogue
v0.4.5 (2025-01-09):
THE RESORT EPISODE
The Family Circle: Part II
+ 4.425
new renders (with
+158 animations!!
)
+ 9.000 lines
of dialogue!
+ 44 new scenes!
(5 EXTRA SCENES, 12 SURPRISE SCENES...!)
+ 5 new characters!
(4 being subscriber requests!)
(Lotte, Akari, Gwen, Cordelia Rivas, Sera!)
+ 1 new location (The Sunset Resort!)
+ 1 major event: Bring your family to the Resort!
+ Added a search bar to the Contacts App!
+ Added minor characters to a new section of the Contacts App!
+ Added a system to locate each character in-game from the Contacts App!
+ You can now see who's in a location from the Map!
+ You can now preview who's in a room when there are multiple characters around.
+ You can now see when an event is taking place somewhere from the Map.
+ Prepared some systems to be implemented in the next update - 0.5.0!
Totalling...
~ 15.000 renders
~ 34.000 lines of dialogue
v0.4 (2024-03-15):
TREASURES & MAPS
+ 3.300
new renders (with
+272 animations!!
)
+ 500
new sprites!
+ 7.800
lines of dialogue!
+ ~50
new scenes!
+ added
map system
+ 3 new locations
(LoveZone, Mall, Coffee Shop)
+ 2 new characters
(Tina and
???
)
+ Reach
LVL 100
with
Chloe, Karla, Michelle, Alice and Tina !
+ improved audio system
+ reworked notifications & improved UI
+ 2 new ways
of making money!
+
and a secret way of becoming a millionaire...
Totalling...
~ 10.500 renders
~ 25.000 lines of dialogue
PLUS:
+ 3 Extra Scenes,
requested by subs!
v0.3 (2023-07-20):
THE FAMILY CIRCLE - PART 1
+
2.300
new renders (with +200 animations)
+
540
new sprites
+
6.200
lines of dialogue
+
~40
new scenes
Totalling...
~
7.200
renders
~
17.200
lines of dialogue
PLUS:
+ 2 Extra Scenes
, requested by subs!
You can access these by doing
Greed's little quest.
Don't forget to be very diligent!
v0.2.1 (2023-04-15):
SECOND HALF OF THE PROLOGUE!
+2.700 images & animations
+6.150 lines of dialogue
+14 kinetic scenes
Totalling...
4.900
images & animations!!
11.000
lines of dialogue!!
PLUS:
+ Early Preview for the
SANDBOX
+ Added Replay Gallery (GALLERY)
+ Added Character Details (CONTACTS)
+ Added Event Tracker (MY NOTES)
+ Added 'Unlock Gallery Entries' Cheat (SPECIALS)
PLUS!!
+ Everything added in the previous hot-fix (0.1.1)
v0.1.1 (2023-04-08):
Hot-fix addressing a few things:
+ Added a slider in the settings that lets you control the intensity of Screen Shakes
+ Added the option to skip certain scenes
+ Rewrote a few segments to better contextualize character's motives
+ Replaced nearly every song, sound effect and font used in the game
(I had to)
+ Included subscribers (as of April 8th) in the credits section.
v0.1 (2023-04-01):
Release of the game -
FIRST HALF OF THE PROLOGUE!
+2.200 images & animations
+5.500 lines of dialogue
+18 NEW kinetic scenes
Player reviews
Player rating4.5 / 5 · 20 ratings
Written reviews20 · avg 4.1★
Positive (4–5★)70%
Latest review2026-02-26
What players say
Most players rate it highly, praising variety and visuals, while some criticize pacing, slow burn, and unfinished sandbox content.
5★10
4★4
3★4
2★1
1★1
Players like
Diverse characters and kinks
Strong visuals and animations
Interesting premise and writing
Memorable scenes and compelling characters
Common complaints
Slow pacing and long prologue
Few explicit scenes or limited progression
Repetitive dialogue and text-heavy play
Best for players who enjoy varied kinks, strong visuals, and dark supernatural adult stories.
Summarised from 20 written player reviews.
-lust-2026-02-26★★★★★
Diversity of characters 'n kinks. This is a top tier HS game that doesn't take itself too seriously, it's fun, engaging and has memorable scenes even if, sometimes, the most memorable ones aren't canon Highly recommend giving this a shot…
The Lamb Sauce2026-01-20★★★★★
I have to say this shit is peak like JJK of porn game. The content of the game itself is nothing special too special but the scenes: the context, writings, and renders of them are so hot and is exemplary…
hairy_trump2025-11-17★★★★★
I giving it four stars is because the purple guy scenes go hard, but the main guy remains in his base body he is dumb, writing is frustrating and meandering . The movment scene is janky . Overall I will…