Shūsui Kagami, nicknamed "Akimizu-chan," is a high school student and classmate of Gekko-chan who devotes herself to forging friendships despite struggling with social nuances. Determined to refine her interpersonal abilities, she meticulously studies a friendship guidebook and implements its strategies with disciplined focus, experimenting with ASMR sessions as a deliberate tool to deepen her connection with Gekko-chan.

Shūsui sports long, ink-black hair and warm brown eyes, her appearance anchored by a standard school uniform. She adheres to her school’s dress code with a crisp uniform ensemble featuring a pleated miniskirt and a neatly tied ribbon.

Her story centers on her quiet evolution through persistent trial and error, methodically learning social strategies to bridge gaps between herself and others. This disciplined pursuit underscores both her resolve for self-betterment and her yearning for authentic bonds, framing a journey where tenacity and empathetic curiosity gradually dissolve barriers.