MC time travelled from the 20th century to the modern world he lost all his memories about the past. back in the past he was in love with the ML GRANDFATHER but when he time travelled he fell inlove with his “ grandson”. So the MC decided to GO BACK in time to break up properly with the grandfather so he can be with the grandson together. ( -> open ending ) didn’t show us if they really got back together MC just disappeared
Ao ni Naku