Kaiinu to Yakuza

The long-awaited spin-off of the hit series High School boy and Yakuza is here! "Why is my life so crappy?" Yui laments his life despite being a candidate to take over the Todo Family, one of the largest Yakuza families in the Osaka area. He was separated from his older brother, Kazumi, when they were children, he has never stopped waiting for him. When he finally finds him, he's become the young head of the rival Joshima family in Tokyo. However, Yui finds that instead of him, Kazumi has another by his side... Jealous of his brother's boyfriend, Yui attacks him, angering Kazumi and forcing him to place him under the watch of his underling, Ryo. At first, Yui is wary of him, but Ryo slowly fills the hole in Yui's heart with his kindness and...?! (Source: MangaPlaza) Note: Includes two extra chapters.