Your little sister, Natsuki, suddenly shows up in the middle of your busy days. Apparently she came to take care of you while she was on her summer vacation. This is the story about you and Natsuki one summer
Th-This is normal.
هذا طبيعي
I-Ist doch ganz normal.
N-Non è niente di che in realtà.
I-Isso é normal.