Hatsukoi ga Amai Mou Ai ni Kawaru Toki

Reona Mizuno becomes a modern literature teacher at her former high school, where she unexpectedly encounters Yuki Nagasako, her past crush who is now a PE teacher. After a night of heavy drinking at a welcome event, she wakes up beside him. Their history resurfaces, and it appears Yuki may have had feelings for her in the past as well. The two navigate their renewed connection as colleagues with differing personalities—Yuki is composed and understanding, while Reona is quiet and reserved.