My childhood friend Yuta and I are not friends, family or lovers. I thought our relationship would continue like this forever. I felt that if I confessed my feelings to him, our relationship would fall apart, so I kept my feelings for him hidden and grew up, and he got engaged to another girl. On the night I was introduced to his fiancee, Miki-chan, I watched as the two of them slept together, drunk and together, and Kokoro to put an end to my long-standing unrequited love.