Kojiro is a third year student and in charge of aircraft design at A-TEC. He acts maturely in class but is discreetly a sleaze. He is good friends with Sakugo and Subaru.

A romantic comedy set in a near-futuristic world about the troubles and tribulations of high schoolers on salary. With aims to one day reach out into the stars, humanity has colonized all the planets of the solar system. This story of young high school hopefuls is set in Fourth Tokyo in a Japanese Martian prefecture. Iris Shirasaki is a third year student/aspiring test pilot. Mizuki Sera is her peer/mechanic and Mizuki's brother Kaito is their homeroom teacher and the young director of the program developing their talents.<br>
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(Source: Crunchyroll)

__Height:__ 162 cm
__Hobbies and abilities:__ drums, guitar, singing, dancing, painting

__[Website](http://www.toyonaga.info/) | [Blog](http://ameblo.jp/tossy-t/) | [Web Diary](http://set.cocolog-nifty.com/toshi/) | [Twitter](https://twitter.com/TossuiKUN) | [Anison](http://anison.info/data/person/16256.html) | [Super Eccentric Theater](http://www.set1979.com/member/%E8%B1%8A%E6%B0%B8-%E5%88%A9%E8%A1%8C/) | [Facebook](https://www.facebook.com/toshiyuki.toyonaga.9) | [Wiki (jp)](https://ja.wikipedia.org/wiki/豊永利行)__

He is a Japanese voice actor, actor, singer, songwriter and composer (under T. Toyonaga), and has ranked 7th nationally in the drummania rankings. He is currently affiliated with Super Eccentric Theater INC.

<b>Non-anime roles:</b>
~! Kachiroh Kato in "Musical Tennis no Oujisama: Dream Live 2nd" (Musical)
Kachiroh Kato in "Musical Tennis no Oujisama: Dream Live 3rd" (Musical)
Kachiroh Kato in "Musical Tennis no Oujisama: Side Fudomine in winter ~special match~ 2004-2005" (Musical)
Kachiroh Kato in "Musical Tennis no Oujisama: Side Yamabuki feat. St. Rudolph in winter 2004-2005" (Musical)
Kachiroh Kato in "Musical Tennis no Oujisama: The Imperial Match in winter 2005-2006 " (Musical)
Kachiroh Kato in "Musical Tennis no Oujisama: The Imperial Match" (Musical)
Kachiroh Kato in "Prince of Tennis Musical 2" (play)
Kachiroh Kato in "Prince of Tennis Musical 3" (play)
Kachiroh Kato in "Prince of Tennis Musical" (play)
Kachiroh Kato in "Prince of Tennis: Dream Live 1st" (concert/play)
Kaede Okumura in "Prince of Stride" (VG) (Japanese)
Kei Percival in "Caladrius" (VG) (Japanese)
Mikado Ryūgamine in "Durarara!! 3way standoff" (VG/PSP) (Japanese)
Mine Ryutaroh's friend in "Nodame Cantabile" (TV series)
Random person typing back to 731 in "Densha Otoko" (TV series)
Shota Hikasa in "Battle Royale II" (movie)
Sousei Tachibana in "Yumeiro Cast" (VG) (Japanese)
Xiba in "Soul Calibur V" (VG/PS3,Xbox 360) (Japanese)
Jiaoqiu in "Honkai: Star Rail (VG) (Japanese !~

Unaired episode included with the third Blu-ray and DVD volume.

Kojiro Kitahara