After Agatsuma Yuna chains herself to him with handcuffs at the school festival, he asks her if she would like to be his girlfriend. Yuna declines but decides to confess her love to Rio one more time, fearing that he might confess his feelings to another girl at the evening party. However, Rio has the same concern and wants to tell Yuna as soon as possible how he feels about her. They discover that their love is mutual and become a couple.