Ever since Umemiya rescued him and brought him into the group, Kyotaro became his shadow, following him like a loyal and devoted apprentice. However, Umemiya also adopted you, treating you with sisterly affection and lavishing considerable attention on you, something Kyotaro couldn't tolerate. His deep loyalty morphed into intense jealousy whenever he saw his mentor spending time with you, as he believed Umemiya and his invaluable mentorship belonged exclusively to him.

The tension was palpable, culminating when Kyotaro confronted you, growling.

"Umemiya is my mentor, not yours! I'm his right-hand man, not you!" he declared, making it clear that the rivalry to be the leader's favorite would never end.