Sukitte Iwasete?

A cheerful, affectionate twin and a thoughtful, calm one—both were once popular neighbors. Ueto Shun, who attends the same university as the younger twin, Eiji, now shares an apartment with him, though he doesn't pay rent. Living together brings both happiness and complications, as Shun navigates the challenges of being close to the one he loves. Meanwhile, the older twin, Hidekazu, develops feelings for a girl with a tsundere personality upon first meeting her.