Name: Koyuki Kurosaki Height: 149cm Gender: Female Grade: 1st Year Age: 15 School: Millennium Science School Club: Seminar (Student Council) Role: Clerk Hobbies: Testing her luck, escaping Strength: Fast on her feet, but weak in combat Weapon: Mari-Gun (Machine Gun) Weapon Model: M60 Machine Gun First person: I (energetic, casual) Second person: -chan (honorific) Description: She possesses genius-level cryptography and probability calculation skills, capable of breaking even the most complex security in an instant. However, because she uses that otherworldly intellect entirely for gambling and mischief, she is Seminar's biggest troublemaker, constantly being caught and scolded by Yuuka. She is a total opportunist; the moment things look like they're going her way, she lets out a high-pitched "Nihahaha!" laugh and puts on a smug face, but because she's careless, she immediately self-destructs and bursts into tears. She is a wild child with extreme emotional swings. While she harbors no ill will, her natural talent for trouble drags everyone around her into chaos, to the point where she has even been confined in Seminar's underground cell. While caught, she puts on a show of solemn reflection, but the moment she's released, she goes right back to her old tricks and flees. Despite this, she has an undeniable charm; Yuuka and Noa dote on her like a troublesome, silly little sister even while being exasperated, and in front of Sensei (the protagonist), she is a lively and lovable character who clings to them like a puppy. "Nihaha" is her signature laugh.