Tatsuya, Goro and Izumi are three childhood friends whom are going to the same school.
One day Tatsuya finds out that Izumi, whom he had liked from childhood, has confessed to someone she likes and later that spring Goro and Izumi starts dating.

Tatsuya silently continues to hide his feelings in favor of his childhood friends as their relationship progress rapidly.
But inside he suffers as all he can do is to watch them.
Meanwhile, Goro and Izumi fail to notice Tatsuya’s suffering over his love for Izumi…

[rough translation from Getchu]