; :; portrayed by:
Yuna Taira (film) :Karin is a 16-year-old daughter from a
nouveau riche family. Owing to her father spoiling her since childhood, Karin is initially arrogant and haughty, but she learns to take care of herself when she moves in to live with Nao. She has a positive outlook on life and is determined to make Nao fall in love with her. ; :; portrayed by:
Kento Nakajima (film) :Nao is a third-year student who is popular at school for his friendly personality, high grades, and athleticism. He agrees to marry Karin only for financial gain and independence from his parents. After his parents' company became bankrupt, their fights have caused Nao to get occasional panic attacks and avoid getting into romantic relationships. Nao initially wants nothing to do with Karin, but he slowly becomes fond of her the more time they spend together. ; :; portrayed by:
Yuri Chinen (film) :Isuzu is Karin's childhood friend, who she nicknames "Rin Rin." He is popular at school for his androgynous looks, but because Karin had always defended him from unwanted attention, he is in love with her. He resents Nao for marrying her, but he is often viewed as immature due to his selfishness and age. He is from a wealthy family with a highly influential background. ; :Portrayed by:
Maika Yamamoto (film) :Saaya is Nao's ex-girlfriend. ==Media==