Mysterious things keep happening because of the unknown virus called the Forgotten, and Beyonders who got superpower from the infection of the virus...

The whole world, however, remains unaware owing to the plots of a transnational organization.

Among the few who know about the secret of the Forgotten, you have to make it through the unusual life.

To protect the ordinary but precious days, you choose to fight together with those Beyonders. They will lose their wits as the power grows in them, but what if there is something you have to safeguard...?

UnderStrange: in the City of Madness is an action-adventure RPG that enables you to bounce back and forth from the real world to a supernatural realm. You can team up with a diverse cast of girls, each with their unique personalities and abilities, to settle those mysterious things.

[Action RPG Combat System]
Use skill tricks to perform combos. Feel the excitement of the combat with just a few taps!
Power up your lineups with proper team compositions to win the game!

[Develop Character Bonds]
Expand your team by looking for characters with unique abilities from another world.
Get along with them in different forms of communication, let down their guard and explore their secret stories.

[Mysterious Journey with Friends]
Team up with 3 other online players to join the real-time co-op mode The Forgotten Battle!
Explore the mysteries alongside your friends!

[Play in Both Landscape and Portrait at Ease]
The game is tailored for mobile, so players can switch easily between Portrait and Landscape Mode. Have fun in both Action and Idle!