Someya didn't have amnesia. He delibetarely lied to Sensei, because he didn't want to remember the bad things that could jeopardize their relationship, that's why he feels guilty and try to flee. But Sensei's love support him.
Someya didn't have amnesia. He delibetarely lied to Sensei, because he didn't want to remember the bad things that could jeopardize their relationship, that's why he feels guilty and try to flee. But Sensei's love support him.