My Sweet Girl Vol. 9 (Kodansha, 2019)

Koeda and Masamune's bond has deepened through their hot springs trip, and now that their second school year has begun, they're in the same class! However, so is Hagiwara-san, a girl who's completely in love with Masamune. Masamune can't help but worry about Hagiwara-san, and Koeda feels anxious about the whole situation. Suddenly, something terrible happens!