Movie
Description
Taiko Kumou, originally named Taiko, joined the Kumo family by adopting its surname upon marrying Koyuki. They raised three sons: Tenka, Soramaru, and Chuutarou. He founded and served as instructor for the Yamainu Squad, training members including his eldest son Tenka, Kiiko, Sousei, and Mutsuki Ashiya. His leadership blended patience and energetic guidance, tempered with necessary strictness. He openly expressed care, encouraging students like Sousei to stand tall and affirming their potential for strength. Taiko perceptively recognized others' emotional states, bringing Sousei into the Yamainu after sensing his loneliness.

Taiko shared a deeply affectionate relationship with his wife Koyuki. Their spirited declarations of love often resembled heated arguments, typically ending in hugs and affirmations. He openly cherished her cooking, claiming it revitalized him and dispelled fatigue, and credited her essential support for enabling his hard work and bringing him happiness, telling her, "I can only keep working so hard because of you! I’m very happy!!" His interactions with Mutsuki Ashiya were comfortable and parental, contrasting with Mutsuki's own family; Taiko consistently demonstrated concern, inquiring about his whereabouts.

Taiko suspected the Fuuma clan operated undercover. Eleven years before the main series, he and Koyuki were assassinated by a masked Fuuma member. This event profoundly impacted their children: Tenka sustained a severe spinal injury and permanent scar protecting Soramaru during the attack. Soramaru witnessed the murder, nearly died from strangulation, suffered memory loss, and developed an intense aversion to neck touches. The trauma fundamentally shaped the brothers' lives, compelling Tenka to assume parental responsibilities. Years later, during a visit to Taiko's grave, Sousei Abeno reconciled with Tenka over his Yamainu departure, implicitly acknowledging Taiko's legacy and the burden of his death.

His influence persisted through the Yamainu and his family. His guidance to students included phrases like, "Stand tall. You are a student who has made me proud. You will definitely become stronger."