Isekai Big Dick

A magic card yanks an ordinary guy out of the modern world and drops him into a realm of anomalies and looming catastrophe, which is a lot of setup for a title this blunt about its intentions.

Once there he meets four heroines with their own personalities, and the real plot is figuring out who ends up at his side while the world's bigger threat gets sorted out along the way.

The loop mixes isekai adventure beats with strategy and actual poker mechanics, so conversations, encounters, and card hands all feed into the same push toward romance. Sandbox structure lets you work through the harem at your own pace, with voiced scenes and animated CG doing the heavy lifting when things turn physical.