Quick answer — "B'z - sekai wa anata no iro ni naru - detective conan movie 20 song" by B'z is the ending theme of Detective Conan: The Darkest Nightmare.
"B'z - sekai wa anata no iro ni naru - detective conan movie 20 song" by B'z is the ending theme of Detective Conan: The Darkest Nightmare.
"B'z - sekai wa anata no iro ni naru - detective conan movie 20 song" is performed by B'z.