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!!