Secret Stay Home with My Girlfriend’s Sister – Motion Anime

Synopsis

A motion anime adaptation of the Appetite PC game “Secret Stay Home with My Girlfriend’s Sister – The Shy Girl’s Forbidden Affair!”

A reverse NTR story: An ordinary, serious man finds himself seduced by his perfect girlfriend’s stubborn, introverted, socially awkward younger sister as he gradually gives in to her clumsy advances.

■Story

Amarifune Sayoko is my girlfriend since our school days. I love her dearly and after getting a job, I wanted to marry her. We’ve been dating with marriage in mind and recently started living together with both families’ approval in preparation for marriage.

Her younger sister is Amarifu Emiru—serious but poor at socializing, with a slightly off-kilter personality. When their family home requires renovation, their parents move to a monthly rental apartment closer to work. However, Emiru is still a student, and moving with them would make school inconvenient, so she temporarily moves in with me.

At first, Emiru barely greeted me and hardly spoke. But gradually, over time, she began to open up—no smile, but less hostile. Then one day, as we work and study side by side, Emiru starts fidgeting and touching me. Not accidentally, but making it seem accidental. She keeps getting close, deliberately bumping hands and tangling her legs with mine, gazing at me awkwardly yet temptingly—