52 Hertz no Kyoushin

Shirane is a high school teacher and omega who tries to lead a regular life. When he is put in charge of a school trip, he meets his high school classmate Kiyonari again at a meeting with a travel agent. While he feels nostalgic, he is affected by Kiyonari, who is an Alpha and is suddenly attacked by heat. When Kiyonari finds out that Shirane is an...