LOVE IS CLOSE
Chapters 1-3
The adopted younger brother falls for the shorter but older brother. The younger brother was never loved by his real parents but his adoptive family love him.
Side story:
(12-13) Host Hayase meets his stepbrother Riou after years of separation
Story of the Royal Guards Jin and Chaa
Jin is the son of the legal wife while Chaa is the son of the mistress. When Chaa's mother died he was taken in by the main family in order to protect Jin. To Jin, it seemed like Chaa was getting close to him because Chaa was told do so. This pained Jin so much because mote than anyone else he loved his brother so much even if such love is forbidden.
Yamato and Shouji became stepbrothers when their parents remarried. Since their parents decided to work abroad, they only have each other in Japan. However Yamato is feeling suffocated with Shouji's meddling. Also, Shouji seems to be getting a little more touchy than necessary.
Two brothers reunite after 8 years of merely sending letters to each other. But when they are finally reunited they realized that their feelings is more than that of mere brotherly love.
Yuuto's mom married again and so their 4-person family lifestyle started with his stepfather and older stepbrother Ryuu. The new additions to their family doted on Yuuto a lot and Yuuto is loving all the attention and spoiling he's getting until he witnessed his perfect stepbrother kissing another man.
Ichiban Chikaku De Koi O Suru