Kisaki calls Takemichi "hero" as a sort of sarcastic nickname or nickname with a double meaning. While Kisaki presents himself as a friend to Takemichi, he often belittles Takemichi and treats him with condescension. Calling him "hero" is a way for Kisaki to mock Takemichi and highlight the stark contrast between his inaction and his desire to change the future. It is also a way for Kisaki to assert his own power and superiority over Takemichi.
