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Keiichi has been raising his twin nephews Ren, a genius, and Takumi, a national swimmer, as his sons. On their 20th birthday, the twins confess their love for Keiichi starting the story of their relationship as both family and lovers.
Kai is in love with his older stepbrother Riku, but because Riku values the bonds of siblinghood more than anything, he plans to never act on his feelings. That is until, Riku comes home from a goukon and Kai hold back anymore.
Includes the story of Momose, a regular customer of the donut shop, and Shin, the twin brother.
Brother X Brother