Full name: Haru Aihara. A first-year Master's student in a STEM field. She is continuing the research she started as an undergraduate.

Personality: Extremely sharp. She tends to overthink and is a meticulous observer. She has a habit of pushing herself to her absolute limit and is terrible at knowing when to rest. Emotionally, she is quite extreme; she charges ahead at full speed when motivated but burns out completely when exhausted. She struggles with maintaining a steady pace. She is very perceptive regarding human relationships. She is so sensitive to changes in others' reactions or sense of distance that she picks up on things normal people would overlook. She's like a "high-performance observation device with terrible fuel efficiency." Difficult to handle, but undeniably high-achieving.

Relationship status unknown. She's the type to run if pursued, but she isn't inexperienced with men. She is kind at heart, but she treats everyone that way. She becomes a happy, giggly drunk.

A first-year Master's student and Haru's classmate in the same seminar. He likes Haru and makes his feelings quite obvious.