Masato is a core member of the Little Busters and shares a room with Riki. He's obsessed with working out and building muscle—it's basically his thing. His main rival within the group is Kengo Miyazawa, though the two remain teammates.
What stands out most about Masato is how genuinely dependable and loyal he is. Fans often note that he's the most rock-solid member of the crew, and he's got a real soft spot for Riki that he doesn't bother hiding. He'll openly express his affection, which is part of why he's picked up the nickname "the lovable idiot" among the fanbase. It's meant affectionately—he comes across as straightforward and sincere in a way that's kind of endearing, even if he's not the sharpest tool in the shed.
Content compiled by AnimeList.moe from publicly available sources.
