Adult PC Game: Inusuku - Imouto!? Life ~Monochrome~ Steam Final Archive

A fantasy life simulation game about living together with your cute sister.
Slowly, little by little, you'll grow closer to each other.

Your parents are adventurers, meaning they're away from home almost all year round,
leaving just you and your sister.

What kind of big brother will you be!?

Inusuku - Imouto!? Life ~Monochrome~ Steam Final Gameplay Preview