Sumireko SANSHOKUIN
Sumireko Sanshokuin is a high school student who is also a librarian. She is known for her analytical skills and her ability to stay calm under pressure. She is also a stalker, and she has been following her crush, Seiya Kanie, for years.
One day, Sumireko is approached by Seiya's childhood friend, Chiyo Sakura, who asks her to help her win Seiya's heart. Sumireko agrees, and she uses her analytical skills to come up with a plan. However, things don't go according to plan, and Sumireko ends up falling in love with Seiya herself.
Sumireko is a complex and interesting character. She is intelligent, determined, and passionate. She is also flawed, and her stalker tendencies make her a difficult person to love. However, she is also a sympathetic character, and her story is one of self-discovery and growth.