The next shrine maidens smile in everyone.

A high school boy finds himself living next door to a cheerful shrine maiden named Miko. She is always smiling and seems to have a secret crush on him, leading to playful and intimate encounters between them. Their daily lives become intertwined as they explore their growing feelings for each other.

However, their relationship is complicated by the presence of other girls who also take an interest in the protagonist. As Miko tries to navigate her own emotions and the competition for his attention, the boundaries between friendship and romance blur. The story unfolds through a series of steamy and comedic situations.