Dragon Grave (Kodansha Lanobe Bunko) [Light Novel]

[Machine Translation] Kuze Yonosuke is the next head of the Kuze Isshin ryu, a school of swordsmanship that claims to be the strongest in the world. However, there is a rule in his school that one must slay a "dragon" in order to be granted full mastery of the art. The long-awaited opportunity arrives for Yonosuke, who wishes to slay a dragon that should not exist anywhere in this world. Summoned to "Agartheia," an alternate world close to Earth, Yonosuke is given a mission by Maia, the queen of the "Kingdom of Quinzaria," to hunt the "dragons" that repeatedly appear and destroy various areas of the world. The Kuse Isshin Ryu and the Kingdom of Quinzaria seem to have a long-standing relationship. Carrying the Raikyoden, a powerful sword that has been passed down in the Kuze family since ancient times, Yonosuke is excited about the task of slaying the vicious dragon. However, he is unaware of the true meaning of the rule of "slaying dragons"... Another world of sword fantasy!

久世世之介は最強を謳う一子相伝の剣術“久世一心流”の次期当主。だが彼の流派には、免許皆伝には「龍」を斬らねばならないという掟があった。この世のどこにも存在しないはずの龍を斬ることを望む世之介に、待望の機会が到来する。地球にほど近い異世界“アガルテイア”に召喚された世之介は、“クインザリア王国”の女王・マイアより、各地に出現し破壊を繰り返す「龍」を狩る任務を与えられた。―どうやら久世一心流とクインザリア王国の間には、長年に亘る因縁が存在するらしい。古来久世家に伝わる豪刀『来業伝』を携え、凶悪な龍の討伐に心躍らせる世之介。だが「龍を斬る」という掟の真の意味までは気づいていなかった...。異世界豪剣ファンタジー登場!