Kijima Riku

First-year student (transfer student) at Aigaoka Private Academy

Tokunori's third son and Hyouka's brother-in-law. With Toru set to become the company's next president, he lives his life selfishly, with no plans for a position of particular responsibility.

He grew up selfish and disobedient, a problem child. He transfers to Aigaoka Academy with Hyouka.