Fukou-kun no Saiwai

Touri knows he's unlucky, and that's why he lives humbly and quietly without friends. The only things that make him happy are games, social media, and Hiro, his big brother-like childhood friend. Hiro told him about some forbidden "rituals" to turn your luck around, which led to a physical relationship between the two. Touri finds joy and comfort in these acts, but one day, Ryouma, a good-looking, happy-go-lucky guy, transfers into Touri's class. He's so different that he frustrates Touri, who decides to just ignore him, but Ryouma approaches Touri anyway. This is the story of a super unlucky guy and his lucky classmate in pursuit of their happily ever after!

(Source: Renta!)