Takeshi Aiza
Takeshi Aiza
相座 武士
Aiza Takeshi
 Gender Male
 Birthday N/A
 Age 14
 Status alive
 Relatives Nagi Aiza (Sister)
 Occupation Pianist / Student
 Japanese Voice Yūki Kaji
 English Voice Erik Scott Kimerer
 Manga Chapter 9
 Anime Episode 06: On the Way Home

Takeshi Aiza is a character appearing in the Shigatsu wa Kimi no Uso series. He is the older brother of Nagi Aiza.

Appearance Edit

Takeshi is shown to be a tall male with blonde spiked hair and blue eyes. Takeshi is usually seen in his formal attire, which consists of a smart blue suit and black shoes, but is also shown in casual attire at times, consisting of a white t-shirt with an artistic design on it, and some jeans as well.



Takeshi has a very honest and straightforward personality. He is very upfront about his rivalry and hatred at first for Kousei Arima. This hatred is later revealed to be an admiration of Kousei and how he looked up to Kousei as a hero. Takeshi looks up to Kousei to the extent of rebuking Kousei when he did not meet his expectations as a pianist. He then starts hating him because Kousei and his little sister, Nagi, played a duet.


Takeshi is one of the best piano players of his generation, as mentioned for being invited to Europe for competitions and winning the majority of recent piano competitions in Japan.


It was shown that prior to the storyline, Takeshi and Emi Igawa are sitting together complaining about the "emotionless" Kousei after losing to him in a piano competition. The rest of the crowd points out that Takeshi and Emi are head and shoulders above the rest of the competition, which makes Kousei all the more invincible for beating the two. In the storyline, it is shown that Takeshi looked up to Kousei as a hero, and constantly practiced in order to surpass Kousei.

Relationships Edit

Nagi Aiza Edit

Takeshi's little sister. She looks up to Takeshi as her 'hero' and starting playing piano to get his attention.

Kousei Arima Edit

Takeshi's biggest rival and "hero", as Takeshi states it, since childhood. He often complains about how he lost to Kousei. As the story progresses, the two get closer together, becoming friends. Before the final competition, he is shown worrying over Kousei's health.

Emi Igawa Edit

Takeshi's other rival. He is often seen hanging around and complaining about how he lost to the 'emotionless' Kousei after losing to him in a competition.

Girlfriend Edit

A person briefy shown in the manga. She gets mad at him when he tries to use the piano as an excuse to miss a date. After Nagi and Kousei’s performance, she tries to convince him that his sister is very gifted, and that she is more than what she seems to him.



  • (To Kousei) "Are you watching? Are you listening? Arima?"
  • (To himself) "Heroes are powerful. Heroes are lonely... and they walk off alone in the final scene. He was just like that too."
  • (To Kousei, inner monologue) "Goodbye, hero."
  • (To Kousei) '"Hey, we're musicians. So everything's gotta be expressed in music,right?"'


Saki Arima "The piano is you. If you touch it gently, it will smile. If you touch it with force, it will become enraged"
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