Himari brings Yuuto back to his childhood home in Noihara, but he receives a not-so-warm welcome from the current caretaker. While Himari tries to jog Yuuto's memories, a pair of demons attack! Can Yuuto keep the peace, or is fighting the only solution?

Yuuto learns more about the magic imbued inside him and the dangers of Himari losing herself with blood lust. Unwilling to let that happen, Yuuto trains to develop his power. But the girls have a unique training method…can he survive?!

Another Demon Slayer appears! But she's not looking for peace with the demonkind. Even worse, she's claiming to be his…fiancé?! Is she here for love or war?