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Yūsuke Igarashi
Kanji 五十嵐 祐輔
Rōmaji Igarashi Yuusuke
Age 17
Birthday May 8th (Taurus)
Status Alive
Gender Male
Height At least 6 foot (According to the mangaka)
Professional Status
Occupation High School Student
(2nd Year)
Class Class 2-A
Manga Chapter 1
Voice Actors
Japanese Yūki Ono
English Alejandro Saab
Drama CD Yoshimasa Hosoya
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Yūsuke Igarashi (五十嵐 祐輔 Igarashi Yūsuke) is a second year high school student and one of the four boys who are trying to win Kae Serinuma's affection.


Igarashi is a handsome teenage boy with a tan complexion, short dark green hair, purple eyes with a light-yellow tint and a tall but athletic build. Due to being in top shape for the soccer team he plays in, it's worth nothing he is quite muscular.


Igarashi is a kind person with a competitive personality, this especially evident when it comes to sports or when it comes down to him trying to win over Kae Serinuma from his rivals.

Although Igarashi is seen as jovial around the people that he generally hangs out with, however, much like his love rivals - he can be equally prone to jealousy if a romantic moment has Serinuma involved.

Though, he isn't remotely fond at the idea of Kae being alone with someone else other than him, he usually finds the opportunity to have her all to himself before anyone else could. This is pretty evident from when he was the first to suggest a movie date (as in just the two of them before the others had joined in) or when he wanted to take a picture with her in a photo booth - or just about any moment that he's willing to take it upon himself to find at any given chance.

Before Serinuma's sudden body transformation, his kindness towards her had remained, but after seeing the former's dramatic weight loss, he's become more bold in both his words and actions, which only results in Serinuma growing intensely flustered as a result.

Due to Shima Nishina's statement on how he only loves Kae for her looks, which is why he started to develop feelings toward her, Igarashi instantly disagreed with that statement. However, as soon as when he began to question his feelings toward Serinuma more - especially after the latter became large again during the Valentine's Day arc., he eventually puts his feelings for Kae to the test and started to wonder more about his attraction to her.

However, after spending some alone time with her on the roof, Igarashi then came to realize that regardless of Kae's appearance, Kae is still the same kind-hearted beautiful person that he fell in love with. This causes him to fully accept her large physique and fall in love with her all over again.


Kae Serinuma[]

Kae is Igarashi's love interest whom he was nice with before her weight loss, but he started to become interested in her once she gets thin. In other hand, Igarashi is the first to truly fall in love with her. He can be seen as the most serious of the five, as he's always the first to try and separate Kae from the rest of the group. Igarashi isn't very hesitant on having physical contact with Kae to the point of invading her personal space, something that was notorious during the school festival, when he grab her hand without consent. After witnessing how much stressful was the festival for Kae, he was the first one to genuinely apologize to her.

During the group visit to Shima Nishina's house for Valentine's Day, Igarashi's feelings were questioned by Shima herself, when she claims that he only liked Kae for her appearance. When Kae returns to being large, he falls in love with her again. Yuusuke realizes that she's still the same person, admitting how admirable and interesting Kae actually is. After his love epiphany, Yuusuke became more softer and gentler regarding his interactions with Kae, something that was noticed by the others characters. His jealousy and possessiveness became less notorious too, as he show having fun while seeing Nozomu Nanashima and Kae dancing together, or when he take the initiative on helping to restore the friendship between Shima and Kae. During Kae's birthday, he is the only one who bought her an actual non-otaku present, an expensive pendant. When Kotoha (Igarashi's first love) was about to confess to him, Igarashi never wavered his feeling towards Kae, too the point that Kotoha herself see how much he loves her and admits that Yuusuke has already found his ideal girl. While Kae was kidnapped by Takeru Mitsuboshi, Igarashi and Asuma Mutsumi were the ones in the front of the rescue, and even after Mutsumi's accident he still stayed by Kae's side, angry that he couldn't do anything to stop her sadness.

Igarashi saved her twice from being sexually harassed: the time at the school cultural festival and the second was at Nanashima's house (although he was under the influence of his fever). He also often thinks of Serinuma first when she is missing, such as when they were separated on the island. They also do a daily "exercise" where they shake hands so Serinuma can become used to intimate contact with him.

Nozomu Nanashima[]

Nanashima and Igarashi have been best friends since middle school. The two met while competing for a position on the school soccer team. Igarashi and Nanshima saw each other as rivals but also great friends. Unknown to Igarashi, Nanashima developed an inferiority complex toward Igarashi due to his envy that Yuusuke is a better athlete than him. Despite this, the two remained close friends. Both of them are well known and popular in school for their athlete ability. Due to Igarashi's "good guy" image, Igarashi usually scolds Nanashima when he said something offended or rude. Ironically, due to Nanashima's "bad boy" image and Igarashi's "good guy" image, the majority of the school know of their close friendship and how they are always with each other. Unknown for them both, Kae Serinuma saw them as a couple. Due to her definition for coupling and her BL-mind, Kae usually saw them as a BL couple. However, after Kae came back to school from a week of absence and lost significant weight, Igarashi and Nanashima develop feelings for her. They competed for her affections along with her other suitors. Despite their rivalry, Nanashima and Igarashi help Kae in any way they can.


  • "Serinuma-san Uh.. If you like, why don't we watch a movie together?" (to Kae Serinuma)
  • "I had no intentions to continue playing nice with everyone."


  • The name Yūsuke means "divine help, divine protection" (祐) () and "forerunner, herald" (輔) (suke).
  • Yūsuke's surname Igarashi means "fifty" (五十) (ig) and "storm, tempest" (嵐) (arashi).


  • Igarashi was born in May.
  • Igarshi's star sign is Taurus.
  • Out of the 4 boys, Igarashi is the only one who is not a virgin.
  • Igarashi's appearance is similar to Sosuke Yamazaki from the popular anime "Free! Eternal Summer".
  • Igarashi's name is written with the character for "5" which is why Kae Serinuma's ship name for both him and Nozomu Nanashima is 5x7.