The Tale of the Demon King

You've been summoned to another world in order to protect the Kingdom of Monsters.
An elf, a mermaid, and a centaur girl greet you on your arrival.
Their banter will lend a comical tone to your new daily life, but don't let your guard down! The battles are going to be tough.

Get stronger, deepen your relationships with the girls, and learn more about the world you now call home.
Things may be light-hearted and fun most of the time, but the humans will stop at nothing to wipe your kingdom off the map unless you stop them!

You're a weak, modern-day human, but if you're defeated you'll revive right on the spot.
For your army, it's the opposite -- they're strong, but not immortal.
Make yourself useful on the battlefield and protect your units!
You may have seen immortal isekai characters before, but now it's a gameplay mechanic!

Items and units are displayed as cards.
You can create more, giving you over 200 options with which to build your deck!
Depending on the cost, you can field 3 armies (decks) at once, so choose your cards wisely!
With so many units on the map at once, things are going to get to get chaotic!

Battles play out like a TCG, so you can enjoy the feeling of summoning strong units from your hand.
Use the over 200 cards to create the deck that's just right for you.