Conan: Training in Martial Arts and Immortality

"Although I don't understand why I got a secret book of cultivating immortals in the world of 'Ke Xue', but with the example of Koizumi Hongzi, it should be possible, right?" Zhang Long looked at the secret book in his hand and muttered unconfidently. The main world of Detective Conan is interspersed with other worlds, and the blank spaces of each world are written from the author's point of view. If you don't like it, don't criticize it. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.