Otona ni Narenai Shimizu Sensei wa

Taiko Shimizu is a 28-year old Japanese teacher at a high school. Her job isn't going well, she has no boyfriend, and her days are boring and dull. She just wanted to fall in love with someone, but the person she met on a dating app turned out to be a married man... Then she met the cool but slightly mean Tsumura at a bar called "Yoru no Happening" where they have a "book club"! This is a love story about a mature woman dealing with the mistakes in her life! (Source: Taiyoutosho, translated)