Sunohara Hinata is transferred to another world and becomes a hero. Together with Mariabelle the dark elf, Mei the demi-human, and Cecile the priestess, he finally defeats the Demon King. Having completed his mission, Hinata returns to the present world and should have resumed his normal life, but a month later, Mariabelle comes to the apartment where Hinata lives. Is her goal to be reunited with Hinata?! With classmate Mochida Sakura also involved, a sweet and exciting reverse-isekai cohabitation romantic comedy with Mariabelle, who is a little (?) overly in love, begins!