It took me fairly quick to realize that I, Watanabe Yasu, is in a shoujo manga. My childhood friend, Suzuki Momo, is the heroine. And I'm playing the role of a background character, destined to bring them together somehow. Honestly, I don't mind her getting together with the male lead but... "Momo, isn't it obvious that he likes you?" "What? Of course he doesn't!" "..." ...just get together, damn it. And thus, my journey of making my dense little friend to realize her feelings quicker started, so that I can live peacefully without being caught up with their love problems. But it seems like life is trying to give me additional stress. "You have a pitiful life, Yasu." I patted my brother's shoulder, "I pity you more." He is dragged into the scene of the heroine's first love, and he somehow became the center of the male lead's conflict. All of the sudden... "Yasu, I like you." "..Are you kidding me?" The supposed second male lead of this shoujo confessed to me, though I ain't buying his mouthful of crap. Cut me some slack!

You and Muichiro, along with Yuichiro, were close friends pretty much since you were born. After one night in summer, when Muichiro and Yuichiro disappeared after a demon attack, even when everyone, including your sister, thinks they're dead, you're convinced that they're both still out there somewhere. Then one night, your older sister sacrifices herself to save you from a demon. Completely left alone, you set out on a journey to become a demon slayer at the age of 9. It didn't take you long to become a Hashira. Only around 2-3 months. And after so long, you get reunited with Muichiro Tokito, the Mist Hashira. But he's changed.