Riko Izumi is a student who attends Minami High School. She's quite intelligent, but does not do well in school. She can invent complex mechanical devices in her sleep, and spends nights tinkering on gadgets. All of her extra studying and inventing leaves her exhausted and barely able to function, and she is almost never seen fully awake. Wako Izumi is her older sister. Residents that see her stumbling around the city often try and help her to prevent any accidents. Riko is grateful towards them, and her smile is seen as so absurdly beautiful that people are literally floored and shot through the heart. This is what initially causes Tatewaku to become infatuated with her. The same thing happens to multiple other side characters who form the "Riko Izumi Fan Club", and attempt to prevent Tatewaku from asking her on a date. As a child she was always building, and as she grew older she started tinkering with mechanics and robotics, becoming quite skilled. Similar to her older sister, Riko is not cut out for standard Japanese school and has always had difficullty getting good grades. Now in high school, she dedicates almost all of her time studying, staying up late every night, which leads to her being unable to stay awake in class the next day. Riko is an introvert with a talent for engineering. She prefers to keep to herself and tinker with things. When she was younger she was asocial, but Wako taught her to get over her anxiety. Riko still keeps to herself, but when she's aware enough to respond to other people she's shown to be very friendly, stealing the hearts of everyone she meets.
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