Kuroba Kaito, who had known Kudo Shinichi since he was a child, was forced to separate from Kudo Shinichi after Kuroba Toichi had an accident.
As children, the two of them had made a promise since they were little, Kuroba Kaito, that they would marry Kudou Shinichi when they grow up. Their childhood sweethearts were young and ignorant.
Time flies by, ten years after Kudo Shinichi had almost forgotten Kuroba Kaito, they met again at the same university.
The older Kudo Shinichi becomes more and more arrogant, and the off-kilter Kuroba Kaito.
Um? My Shinichi can't be so arrogant!
This is the beginning of a happy university life.