Hana Tokidoki Kuma

A high school student named Sumito is engrossed in a notebook at a coffee shop and responds to a handwritten message inside. This begins an ongoing exchange with someone he assumes is a girl, communicating only through the notebook. Over time, Sumito grows attached to this mysterious person. Eventually, he learns they will visit the shop in person and goes to meet them. Instead of the girl he expected, he encounters a tall man named Koguma.