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Saeko Kiryuu (桐生 冴子, Kiryū Saeko) is Eita Kidou's aunt who takes care of him after Eita's parents divorced. She works in a gaming company but she rarely comes home due to work. She also knew that Eita and Masuzu Natsukawa wasn't a real couple right from the start. 


Saeko has brown hair that goes slightly below her shoulders. She keeps her hair in a low ponytail style with a hair band. She also has a yellow clip that keeps part of her bangs aside and has brown eyes.


She is kind and a talkative person. Amazingly, she can spend long periods of time without ever sleeping. She is also a great observer and is very keen to discover the relationship between Eita and Masuzu is fake.


Saeko started to take care of Eita when his parents were divorced. Not much backstory was shown in the anime except that she was Eita's aunt and took care of Eita when he was young.


Eita Kidou

Eita is Saeko's nephew. She started to take care of Eita when he was little since his parents were divorced. She was quick to notice that his relationship with Masuzu was a fake one. She tells him to raise flags of her route as well jokingly. She really enjoys his cooking and warns him about how beauty can be deceiving.

Masuzu Natsukawa

Saeko knew that off the start that Eita and Masuzu wasn't a real couple. They later tried to convince Saeko that they were a real couple, but Saeko didn't believe them.


  • According to Eita, she thinks sleeping on desks helps her sleep well.
  • According to Saeko, when she met up with Mazusu, she is late of greeting on 0.5 seconds, that's why she known that Mazusu and Eita is FAKE.