"How long are you going to make cute noises? Kei-nii."

Igarashi Kei has a younger brother who is an actor. Natsume Chiharu, his name Igarashi Haru. They have not seen each other for more than ten years.

Kei, who was taken in by the Igarashi family when he was very young, was never very good at Haru. Haru, who was always rough, one-sided, and made his body hot...

One day, Kei is about to get engaged and runs into Haru again. He is unsure of Haru's true intentions as he treats him as if the decade-long gap between them had never existed...?

Little brother x big brother pseudo-love.