My Common Sense Alteration Life with My Downer-Type Little Sister

A daily life simulation where the protagonist uses a common sense alteration app to manipulate those around him. The game focuses on spending summer vacation with the protagonist's younger sister, progressing from innocent communication and physical contact to increasingly explicit sexual scenarios as new alterations are unlocked. Choices and progression are tied to the app's expanding capabilities, creating a narrative of deepening intimacy through psychological manipulation.