Mushoku Tensei: Jobless Reincarnation (Manga) Vol. 18

A MAGIC BETWEEN WORLDSRudeus is enjoying every moment of his newlywed life with his beloved wife Sylphie. However, there is one other person at the University who remembers life on Earth--Nanahoshi. While Rudeus has much to love in his new world, Nanahoshi desperately wants to go back home. She's designed a huge magic circle meant to bridge the gap between worlds, but when the experiment goes wrong, it creates a dire crisis of confidence that only Rudeus can set to rights.