[12] However, at the request of an industry insider who saw his dо̄jin magazine, his color illustrations and manga were published in the 3rd volume of the MELTY BLOOD Anthology, making his commercial debut while still in high school.

In February 2008, he began publishing Gurīdo Paketto ∞ in ASCII Media Works's Dengeki Maoh magazine.

In April 2013, Kamiya's second light novel series Clockwork Planet, in joint authorship with Tsubaki Himana, began publishing.

Both No Game, No Life and Clockwork Planet have been adapted to manga with Kamiya writing and Mashiro Hiiragi illustrating.

As for "Yū" (祐), Kamiya believes he took it from the name of the main protagonist of Kanon, Yuichi Aizawa, which he was passionate about at the time.

When his first light novel illustration job, Iregyrāzu Paradaizu, was terminated for undisclosed reasons, he wanted to try his hand at manga where he alone was responsible for everything.

[16] He is a fan of the Touhou Project series of games, many illustrations present on his official website of characters like Suwako Moriya[17] and Flandre Scarlet.