Sekai Saikou no Ansatsusha: Temporada 1, Episodio 3

Lugh's magic teacher is a pretty girl named Dia. Being a few years older than Lugh, Dia treats him like a younger brother and sneaks into his bed every night in order to sleep next to him. Because he needs her to teach him magic, Lugh can't complain, but gradually he and Dia grow closer--.

Sekai Saikou no Assassin Sekai Saikō no Ansatsusha Isekai Kizoku ni Tensei Suru Sekai Saikou no Ansatsusha Isekai Kizoku ni Tensei suru 暗殺貴族 Sekai Saikou no Assassin Isekai Kizoku ni Tensei Suru Ansatsu Kizoku