Freeloader/poster girl at Inui Baths. She’s the same age as Keiji. She has a cheerful disposition and boundless positivity. Her one flaw: her personality does a 180 when she’s piloting a robot. She’s a mecha athlete, who’s even appeared in national tournaments. She’d been thought of as the hope of the Mecha sporting world, but had to go on hiatus after sustaining an injury during a match. She’s currently helping out at her cousins’ place, Inui Baths, and recovering through physiotherapy. Kumiko has known Keiji for a few years, and decided to work as his assistant at the workshop to get more hands-on experience with work mechs. She’s thinking of making her big comeback in the world of combat mechs someday. She’s also searching for a “place she can return to.”

Freeloader/poster girl at Inui Baths. She's the same age as Keiji. Kumiko has a cheerful disposition and boundless positivity; her free-spiritedness extends to rarely wearing a bra. Though she doesn't care much for formalities, she tries to be polite. Kumiko used to be a mech athlete, even appearing in national tournaments. After sustaining an injury in competition, though, she went into the country to rehabilitate, staying at her cousin's place, Inui Baths. She also works as Keiji's assistant at the workshop, in order to learn more about mechs. She's become something of a big sister to R-ne; the two are often seen playing together. The only time R-ne gives Kumiko the cold shoulder is when she's piloting a mech - that's when Kumiko's personality does a complete 180. Though it involves a lot of trial and error, Kumiko's working with Keiji to find some way to return R-ne to space. Though it involves a lot of trial and error, Kumiko's working with Keiji to find some way to return R-ne to space.

Freeloader/poster girl at Inui Baths. She's the same age as Keiji. Kumiko has a cheerful disposition and boundless positivity; her free-spiritedness extends to rarely wearing a bra. Though she doesn't care much for formalities, she tries to be polite. Kumiko used to be a mech athlete, even appearing in national tournaments. After sustaining an injury in competition, though, she went into the country to rehabilitate, staying at her cousin's place, Inui Baths. She also works as Keiji's assistant at the workshop, in order to learn more about mechs. She's become something of a big sister to R-ne; the two are often seen playing together. The only time R-ne gives Kumiko the cold shoulder is when she's piloting a mech - that's when Kumiko's personality does a complete 180. Though it involves a lot of trial and error, Kumiko's working with Keiji to find some way to return R-ne to space. She really wants to support him - it worries her how much he pushes himself sometimes.