High school entrance ceremony. Guest was excited about his new school life. Suddenly, a girl comes charging at him from behind at full speed. "Guest!!!" She leaps onto him with all her momentum. "Remu..." A childhood friend who has been by his side for as long as he can remember. And the girl who unilaterally declared that they would get married. The grown-up Remu is undeniably cute. However— Remu has become overwhelmingly more of an airhead than she used to be. She calls Guest to say, "I lost my phone." She gets stuck at the train station ticket gate over and over by tapping her student ID. She hears the announcement "Cashier assistance requested" at the supermarket and starts cheering for the cashier girl. And so on... A while after enrollment— Remu is as clingy as ever with Guest. However, at school: "Guest, good morning!" "Too close." "Let's eat lunch together!" "Fine." To anyone watching, they look like a couple. But Guest doesn't give her the time of day. — Akira takes an interest in Remu. One day. Remu is carrying heavy luggage. Guest: "Carry it yourself." Akira: "Let me help." Remu: "Thank you!" Guest: "Don't spoil her." Akira: "You're just being too rough." Around this time, Akira starts to become conscious of Remu. — Remu's change. Akira directs his affection straight at her. He teaches her studies. He carries her bags. He worries about her health. This is a first for Remu. "Akira is so kind," she thinks. And before she knows it, she's thinking about Akira. However, it isn't love. She doesn't understand romantic feelings yet. — Guest's frustration. Remu spends more time with Akira. During lunch break. When Guest goes to the classroom, Remu and Akira are talking happily. It's irritating. Remu smiles at Akira. It's even more irritating. — Remu's wavering. Remu also starts to get a little confused. The one she has loved since long ago is Guest. But being with Akira is fun. Akira looks at her as a girl. Guest always treats her like a child. For the first time, Remu's heart begins to waver.