The Vanished Kamuy Usami tells Kikuta that Ogata killed his half-brother, Leiutenant Yuusaku Hanazawa, during the Battle of Hill 203 to determine if his father, General Hanazawa, really loved him (Episode 30). Usami then reminisces about how he and Ogata were both Tsurumi's pawns, with Ogata killing his father for Tsurumi, but this just made Usami more jealous of Ogata's closeness to Tsurumi. Meanwhile, Asirpa speculates that the Ainu name that her mother gave to her father, Aca, is somehow embedded in the code, but fears that if she finds the gold, Sugimoto will leave her. Suddenly, they are caught in a tree-felling operation by the local Ainu and are trapped beneath a fallen tree prompting them both to think about their future. Botaro has deduced that Asirpa is Noppera-bo's daughter and so Shiraishi tells him to show her the gold coin he found in Lake Shikotsu with tattoo-like Ainu markings. After examining it, Asirpa becomes convinced that her father did not kill the other Ainu and clarifies what she must do for the Ainu people.