The character runs Ryutei, a Chinese restaurant in Tsutsujidai. His daughter Sakiru Tonkawa, a volleyball club member, died when Akane Shinjo unleashed the kaiju Ghoulghilas. This occurred after Sakiru disrupted Akane’s conversation by accidentally knocking over a Special Dog intended for Yuta Hibiki with a volleyball. Sakiru perished during the school’s destruction, but Illusion Monsters erased the entire incident overnight. The city’s collective memory reset, restoring the school yet permanently removing Sakiru and other victims from existence. When the Gridman Alliance probed Sakiru’s disappearance, they visited Ryutei. Rikka Takarada asked about Sakiru, only to learn she supposedly died years earlier in an accident—a fabricated history implanted by the city’s reset. This overwrote actual events, erasing Sakiru from even close acquaintances’ memories. The encounter revealed the family’s emotional burden as Sakiru’s absence became shrouded in falsehood. Later, Yuta Hibiki confronted Akane over Sakiru’s death while dining at Ryutei. Akane dismissed Yuta’s concerns about the suffering her actions caused, underscoring the unresolved grief inflicted on Sakiru’s family. In a subsequent dream, Yuta encountered the Tonkawa family gravestone in a graveyard, reinforcing Sakiru’s fate and its enduring impact on her relatives. Whether Sakiru and other victims were restored after Gridman’s final Fixer Beam remains unconfirmed.