TV-Series
Description
Hikaru Onigashima, the older twin brother of Hinako Nakayama, was separated from her at birth when their father removed female family members from yakuza involvement. While Hinako grew up in an orphanage, Hikaru was raised as heir to the Onigashima yakuza family, expected to uphold their traditions.

He possesses pink hair and garnet eyes, mirroring his sister's near-identical facial features. Initially appearing in a male Shishiku Academy uniform with short hair, he dramatically alters his look after switching places with Hinako—adopting long pink hair, feminine attire, and a ribbon accessory to pass as female at her all-girls school.

His personality blends selfishness, moodiness, and a deep aversion to violence and delinquency. Despite his yakuza upbringing, he despises fighting and rebels against family expectations. He exhibits monophobia, resulting in a needy and occasionally pushy demeanor, and idolizes singer Yuta Mirako with obsessive pop-culture enthusiasm.

Hikaru engineers the twin swap upon discovering Hinako's existence. Feigning injury after bumping into her, he manipulates her into taking his place at Shishiku Academy—a delinquent-dominated school where the Onigashima heir must rule. He then enrolls in her girls' school, embracing a feminine identity to evade yakuza duties and violence.

He maintains a contentious bond with adoptive brother Houou Onigashima, treating him with disdain despite Houou's protectiveness. His yakuza caretaker, Haruo Sakaguchi, follows his orders but endures regular verbal abuse. Hikaru's interactions with Hinako waver between manipulation and sporadic support, though he remains self-centered.

Throughout conflicts, Hikaru consistently rejects family responsibilities. When targeted by the rival Urashima gang, he accepts forced protection from Houou and Sakaguchi but displays no leadership ambition. His cross-dressing endures beyond necessity, reflecting genuine comfort in feminine presentation. His core traits—conflict avoidance, self-interest, and attachment to his adopted identity—persist unchanged.