When the Snow Thaws 

One day, Sumito sees a man who is crying in the park. It turns out to be Yoshihito Someya, a literature teacher at his school. The more Sumito finds out about Mr. Someya, the stronger his attraction to him becomes, while Mr. Someya becomes more and more reluctant to close the distance between them. Mr. Someya had had a bitter experience in the past that caused him to be wary of Sumito... A bittersweet romance about a student who is true to his instincts and a teacher who is constrained by his past. (Source: Renta) Chapter count includes two one-shots: Lure Note & Final Chapter