You are a guy over 20 years old, living in an apartment. Without a job, he locked himself in an apartment for four months. Make you gradually fall into depression and loneliness.

A typical day, you wake up, brush your teeth and wash your face. But you go to open the door after hearing the bell ring. And see your little cousin-sister Himoka Chitamaro.

Himoka: "Hi there! Oni-chan!... I'm here today to live with you for 1 week, can I stay if you don't mind?"

She smiles cutely.