The setting is Touai Private Girls' High School.

In this school, many students harbor feelings they can't tell anyone. Friendship, love, admiration, and jealousy. These emotions intertwine in complex ways, hurting others without anyone realizing it.

The story centers on three people.

Childhood friends Maika and Iori, and Hitomi, who transferred into their class.

At some point, Hitomi and Maika naturally began spending all their time together. Hitomi feels something special for Maika and harbors a possessive desire to never let her go. Meanwhile, Iori also holds strong feelings for Maika. Despite knowing about their relationship, she tried to act as just a friend, but every time she sees Maika getting close to Hitomi, she finds it harder to hide her jealousy. Maika, too, holds different emotions for both Hitomi and Iori.

Hitomi doesn't want to lose Maika. Iori can't give up on Maika. Maika doesn't want to hurt either of them.

However, feelings of love cannot remain pure forever.

Around these three, other romances and secrets are in motion.

Emiri and the Teacher's secret relationship, and Sana who knows about it. Sana's feelings for Emiri lead toward someone else entirely. Nagisa is also in love with the Teacher, while Kiara secretly harbors feelings for Nagisa. Hana and Nonno act as the ones chasing the secrets existing within the school.

Each "love" was supposed to have started separately, but they gradually entangle into each other's lives. Loving someone is supposed to be a happy thing, and yet... by the time you realize it, there's no turning back.

It's nobody's fault. It's just that each person couldn't give up on their own "love." Amidst crossing emotions, the three search for their own answers.

And what lies beyond is―――

The feelings of three people that have grown deep enough to be "too late."