Takako Shimizu. Hideki and Shimbo's teacher. She has suffered throughout her life, as the man she married fell in love with the Persocon she owned, abandoning her for her. She is very dedicated to her work, although she has the habit of treating her students like little children, and that has a reason: her husband prevented her from being a primary school teacher. Soon after the start of the year, she will get to know Shinbo better and begin a friendship that will transform into a love strong enough to overcome Takako's pain and the age difference between them.