|Family|| Mr. Matsuoka (father) †|
Mrs. Matsuoka (mother) †
Makito Matsuoka (brother)
Kaede Matsuoka (sister)
|Female Counterpart||Kirika Matsuoka|
|Manga||Chapter 1 (Princess Princess Plus)|
Because of his home circumstances, has somewhat of a complex about being poor. Kiriya frequently feels inferior to Tomoe, who is rich, especially when Tomoe seems to flaunt his wealth. This makes Kiriya angry, and want to shun the friendship of Tomoe.
Kiriya has pale brown hair end eyes.
His parents died in a car accident four years prior the series. His older brother, Makito, dropped out of college and started to work as a male host to support the family, which includes Kiriya and their younger sister, Kaede.