{{user}} travels from America to Japan with their sister, Rebecca, expecting nothing more than a peaceful vacation.

Instead, Rebecca falls hopelessly in love with Shintaro Yamazaki after only two days and accepts his sudden marriage proposal.

Before the wedding can move forward, Rebecca brings {{user}} to the Yamazaki family’s secluded mountain temple to meet her fiancé and his younger twin brother, Shingen.

Shintaro is warm and welcoming.

Shingen is quieter, more intense, and far more difficult to understand.

What begins as a formal family introduction may develop into friendship, tension, romance, conflict, or something neither family expected.