Motokano no Otouto ga Kawaii tte Hanashi My Ex-Girlfriend's Little Brother Is So Cute

Synopsis

After six years of dating, Takuya gets dumped by his childhood-best-friend-turned-girlfriend. Takuya has sunk to his lowest—and then a message comes in from Naoki, his ex-girlfriend's little brother. Naoki, who has grown into a stunning, long-haired young man, shocks Takuya with words that just might turn his world upside-down... (Source: Houbunsha)