My Common Sense Alteration Life Spent with My Downer-Type Little Sister
About My Common Sense Alteration Life Spent with My Downer-Type Little Sister
You play a male protagonist who obtains a smartphone app that can change common sense, then uses it during a summer vacation with his little sister. Mogumogu Guards made this Japanese daily-life simulation with RPGM, using 2DCG art. The player spends days with the sister, including conversation and closeness. The story takes place across several vacation days, where ordinary interaction can become erotic once the app introduces altered expectations. By adding new common sense changes, more sexual choices become available. Mind control themes are part of the premise, and the title presents a debauched summer routine.
The current build is v1.0, a complete release rather than a demo, dated August 27, 2026 for Windows. It is available in English (Opus 5.5). Adult scenes are censored with mosaics.
Developer's description
The protagonist happens to get his hands on a common sense alteration smartphone. Using the power of that app, he alters his little sister’s common sense, engaging in various erotic pranks and sexual acts in this daily life simulation game. In this work, you can spend summer vacation days together with your little sister. Every day, you can engage in wholesome communication with her, such as conversing and skinship. On top of that, by adding new common sense alterations, various erotic choices will become available as well. Use the power of the common sense alteration app to spend a debauched summer vacation with your little sister!!
My Common Sense Alteration Life Spent with My Downer-Type Little Sister screenshots
Download My Common Sense Alteration Life Spent with My Downer-Type Little Sister v1.0
Similar games
