So Cute?またきてしかく; (Good-bye Triangle), Hello Square; Mata Kite Shikaku

A collection of stories: 4-5. Mata Kite Shikaku Ever since losing his parents, Nozomu has been living happily with his big brother, Yu and Yu’s lover, Mitsuo. And while he truly wishes for the both of them to be happy, he has trouble suppressing his own feelings for his brother’s lover… When a man named Ichiya appears and claims to be Mitsuo’s supposedly dead half-brother, are their happy lives about to crumble?!