Tatsumi Sekiguchi is a novelist struggling to make ends meet—his short story work doesn't pay the bills, so he picks up freelance journalism gigs to survive. He and Kyougokudou went to the same college and have stuck around each other since. His friends give him a hard time about being socially awkward.
He served in the military during the war alongside Kiba in the same regiment. The exact details are murky, but there's strong implication he deserted and came back carrying some serious psychological damage from whatever he experienced out there.
He's married to a woman named Yukie.
Content compiled by AnimeList.moe from publicly available sources.
