Warui Otona Ni Narimashite悪い大人になりまして; So we became a bad adult

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...!