Mugen Shinshi: Bouken Katsugeki-hen
Dream Dimension Gentleman ／ Mugen Shinshi BKH ／ Mugen Shinshi DDG ／ Mugen Shinshi: Bouken Katsugeki Hen ／ Mugen Shinshi: Bōken Katsugeki Hen ／ 夢幻紳士 冒険活劇編 ／ 夢幻紳士 冒険活劇編
Description
When a strange group of men attempt to kidnap Atsuko Fukune, a dancer at a club, she seeks the help of Mamiya Mugen, a famous detective - who also happens to be a child. When it turns out that other girls have gone missing, Mamiya, with the help of his butler Alucard, springs into action to solve the mystery. (Source: Anime News Network)