Movie
Description
Shirasu Kinjō serves as housekeeper for the Kumo family, maintaining a calm and polite exterior while managing household tasks. His true identity is Isuke Fuma, former ninja of the Fuuma clan and its 10th generation head, sharing the title Kotarou Fuuma with his twin brother. This shared leadership binds them as one entity despite physical separation.

Born on April 1, he endured the Fuuma clan's rite of passage, killing his own father. This act transformed his appearance permanently, turning his hair white and his eyes purple. It also caused his mother to cease smiling at him, adding to his emotional pain. He once wished for a peaceful life with his parents and brother in their village, a dream shattered by clan tradition.

Ten years before the main events, Tenka Kumo found him gravely injured and brought him to safety. Recovering, he adopted the alias Shirasu Kinjō and integrated into the Kumo household. This infiltration served a deeper purpose: he and his brother had faked the Fuuma clan's extinction to conceal their activities related to Orochi's resurrection. As part of this plan, he murdered Kumo Taiko after the elder uncovered Fuuma links to Orochi; Kumo Koyuki's death occurred unintentionally during the operation.

Though his initial mission focused on discovering Orochi's vessel, a decade living with the Kumo brothers fostered genuine care. He developed protective instincts, warning Botan he would ensure her death if she harmed them. His conflict between loyalty to the Fuuma clan and affection for the Kumo family surfaced in statements about doubting people for those who trust too easily. This duality extended to personal habits; he enjoyed making sweets but proved disastrous at cooking savory dishes, one failure creating a significant mess requiring extensive cleanup.

After Orochi's defeat, he confronted the Kumo brothers and jumped off a cliff, an act initially seeming like suicide. He survived, however, and rejoined the Fuuma clan. He acknowledged his life at the shrine as a "warm, wonderful dream," stating his smile remained there with the identity of Kinjō Shirasu. Despite his return, he retained fondness for the Kumo brothers.

His relationship with his twin Kotarou defined his existence. They operated as complementary halves, with Kotarou noting changes in him during his time with the Kumo family – softened expressions and genuine smiles. Their dialogue revealed deep interdependence; Kotarou stated only Shirasu could unlock his talents and vice versa. They coordinated efforts across locations, Kotarou embedded in Gokumonjo prison while Shirasu monitored the Kumo household.