The protagonist, Leopard (Leo) is a disciple of Batch, the genius monster tamer, yet he can't even tame weak monsters yet. One day he meets with a monster girl, Captain Vanilla, who asks for his help and teleports him to a mysterious island.

This island is created by Baron Squid as his personal paradise. He abducted monster girls from all over the world to chose one to be his wife.

These monster girls, unable to defeat Baron Squid themselves, decided to ask Batch for help, but instead they summoned his yet weak disciple Leo.

[Translated from Getchu]