After a period of absence, the Satou brothers have come back along with Satou Ryouhei, who is the eldest of the siblings, and their cousin Takahashi Jin. One day, Jin woke up to find himself wrapped up in Ryouhei's strong arms as they had been sleeping side by side. Though Jin made an effort to break free, they later ran into each other at a family gathering. Was this just a coincidence or was it predestined?