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Mana Natsukawa (夏川 真那 Natsukawa Mana) is the younger sister of Masuzu Natsukawa who wanted Masuzu to come back to Sweden with her and she also reports her sister's activities to their father. She is always seen with her bodyguard accompanying her at all times. In the light novel, she aimed to make Kaori Asoi fall for her.


Mana has blond hair that is tied up to two pigtails with red ribbons and indigo eyes. She is seen with a long white-sleeved shirt with a red vest over the shirt and a red bow at the collar. She also wears a red pleated skirt and shoes with red ankle-high socks. 


Mana studies at the middle school division of the Nenaka's Girl Institution, a rich girl's school.


Masuzu Natsukawa

Masuzu is Mana's older sister who always reports her older sister's activities to her father but she loves her although she tends to feel inferior compared to her older sister. When Mana told Masuzu's story to Eita Kidou she calls Masuzu jewel. She also told Eita the cause of Masuzu's twisted personality.

Kaori Asoi

Their first meeting was when Kaori pointed out that her underwear is showing, much to her embarrassment. Kaori helped Mana by teaching her how to ride a bike. While Mana initially viewed Kaori as a slave and throw him away while he's useless, her feelings changed. She started to slowly fall in love with Kaori, unaware of his true gender. Kaori, who came in as Kaori and introduces herself as his twin sister, seems to reject Mana's feelings and told her that he was aware of Mana's feelings. She then decided to make Kaori fall in love with her after entering his school and throwing him away like broken garbage.

Himeka Akishino

Mana is on good terms with Hime as she finds her easy to talk to. She wanted to go to the same high school where Hime is studying. Mana started going to Hime's house every Sunday after she once bought a doujinshi during the summer and went to her house to borrow the source. Mana tends to confide in Hime about her worries.

Eita Kidou

Mana tells Eita about Masuzu's background and helps Eita understand that he's in love with Masuzu. At the start she disliked him. When she gets angry, she calls him a "virgin".

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  • The name Mana means "real, genuine" (真) (ma) and "that" (那) (na).
  • Mana's surname Natsukawa means "summer" (夏) (natsu) and "river, stream" (川) (kawa).
  • Mana has a bike nicknamed "Celine-chan". While, she originally goes to school by car but ever since coming to Japan, she had been wanting to ride a bike. She was initially bad at riding a bike but with guidance from Kaori (disguised as Kaoru), she managed to ride it perfectly.