Sayaka Kouno is the yandere for Tooru Kouno from Princess Princess.
Background[]
Sayaka was an only child in her family until Tooru was taken in by her family. When she met him, they instantly formed a close relationship.
Yandere Traits[]
Even though Tooru is related to her, she's obsessed and possessive of him. She hates him talking and being with other girls so much that she once followed him on a date and attacked the girl he was with. Months after the incident, she found out where he was and went to his school to convince him to come back. When he rejected her feelings for him, she threatened to jump off a cliff if they couldn't be together.