Otouto ja Irarenai!!弟じゃいられない!! (Japanese); 才不要只是弟弟而已 (Chinese); Hard to be the Younger Brother!! (English); Ototo ja Irarenai; Ototo ja Irarenai!!; Otouto ja Irarenai

Kai loves his stepbrother Riku from the bottom of his heart. However, Riku treasures “the bonds of siblinghood” more than anything, so Kai must hide his feelings and instead act as a “good brother”… but skinship no longer satisfies him anymore!