Do You Love Your Mom and Her Two-Hit Multi-Target Attacks?, Vol. 4 (manga) — Dachima Inaka

In the hopes of gaining some power-up items, Masato's party-minus Mamako-accept a quest that enrolls them in the MMMMMORG's only school, Gioco Accademia. There, Masato meets the sweet and beautiful Cleric Medhi (and her mother). Masato is suddenly filled with hope at the prospect of a high-school romance blooming-until Mamako shows up out of nowhere, at least!