Hirano and Kagiura, Vol. 1 (manga) von Dayeun Kim

Akira Kagiura has decided. He will marry him. Taiga Hirano, roommate--and the most perfect man who has ever existed! After all, Hirano's bad boy vibe doesn't really matter when he acts so sweet. Like when he wakes Kagi up every morning or cheers him on when he's feeling down...So now there's only one thing left to do: enact his grand plan and overcome the first hurdle--confessing his feelings!