Tawawa on Monday2016–2021

Name: Tawawa on Monday
Genre: Animation, Comedy
Cast: Sayaka Harada, Junji Majima, Ai Kayano, Yasuaki Takumi

The anime follows a salaryman who has a chance meeting with a girl named Ai on the train. They begin to meet every Monday on the train, with the man serving as her bodyguard on the crowded commute while they chat.