Read manga: Warui Otona Ni Narimashite

manga
Summary:

From Rain over Paradise After breaking up with his girlfriend, Natsuno is homeless and has to crash at his office. When he happens to meet his old school friend and admirer, Ui, at a wedding ceremony, he hopes to find shelter at his place. But Ui has lost his memory after an accident, and doesn’t remember Natsuno anymore...!