Mutsumi Shingetsu operates as the second member of the hero team Kigurumikku V3. She transforms into Kigurumikku-Falcon via a specialized cosplay outfit, joining teammates Azuki Edomae (Kigurumikku-Swan) and Serika Shihoudou (Kigurumikku-Swallow) to defend their town's peace. Her older sister, Nanami Shingetsu, maintains the team's operational readiness by repairing their Kigurumikku transformation outfits and accessories using her tailoring expertise.