Kurotokage (1962) and Black Lizard (1968) are based on the same Edogawa Rampo novel. Both films are campy and stylish, although the 1962 adaptation includes a few random musical numbers and is considered ahead of its time. Each take on the story also comes across differently since Kurotokage stars female lead Kyo Machiko as the titular character, while male actor Maruyama Akihiro plays the same role, in drag, in Black Lizard. Both adaptations are worth watching!
Kekkon Dekinai Otoko is the original Japanese version of The Man Who Can't Get Married. If you enjoyed one, you will probably enjoy the other!