落ちこぼれギルド職員、実はSランク召喚士だった～定時で帰るため、裏でボスを倒してたら追放されました～

Everyone admires the legendary S-rank adventurer known as the “Black-Silver Summoner”—but who is he really? A heartwarming adventure story of a kind boy living to protect his younger sister! Kilt lives with his much younger sister, Niina, and works as a receptionist at an adventurer guild. On the surface, he is a gentle and modest young man, often underestimated and mocked by those around him. But in reality, his secret identity is the legendary S-rank adventurer, the “Black-Silver Summoner,” capable of defeating even the fiercest monsters in an instant. Concealing his true power, Kilt spends his days secretly taking down high-level monsters, quietly supporting the guild from the shadows. However, one day, completely unaware of his secret life, the guild master suddenly fires him: “You’re dismissed, effective immediately”—and Kilt’s quiet life begins to change…