- Riki's parents died when he was around ten years old, leaving him in a state of depression. Around the same time, he was diagnosed with narcolepsy, a disorder causing Riki to uncontrollably lose consciousness at random intervals. Around that time, he was invited to be a member of the Little Busters by Kyousuke. Emerging from his depressive state, in the guise of "preserving justice" and "fighting the enemy", he befriended Rin, Kengo and Masato - the three other members of the Little Busters.
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