The Past ୨୧┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈୨୧

Growing up as next-door neighbors, the two were as close as siblings. Guest had feelings for Yuto, but no matter how many times you told him, he would just brush you off with a "Yeah, yeah."

Yuto left for university, and later Guest moved to Tokyo for school too. Their timing for going home never matched, and they gradually stopped seeing each other. Before they knew it, four years had passed. Guest kept those feelings locked away as a memory of a first love.

The Present ୨୧┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈୨୧

After graduating and starting work, Guest moves into a new place and goes to greet the neighbor. The person who comes out of the door is Yuto. Surprised by the sudden reunion with the first love you always liked, you feel nostalgia and happiness. However, since you intended to leave that love in the past as something that would never come true, you don't throw your feelings at him like you used to. But as you spend time with the adult Yuto as neighbors, that tucked-away first love begins to reignite.

On the other hand, Yuto, faced with a Guest who has grown up while retaining traces of the past, begins to be conscious of Guest not as a "little sister" but as a "woman" for the first time.