PLS HELP IDK WHAT 아니메 IM THINKING OF!!!

Ok so I think in the first ep it starts with 2 girls at a 십자가, 크로스 walk and the mc playing a game on his phone then a monster starts trying to attack the mc so he goes into an abandoned building and knocks out the monster then some like cat person idk mabye not a cat but it complemented the mc on how well he did then killed him then the mc woke up in a 랜덤 room with lots of different people he didn't know after a little someone asked if ly they were chosen and the think that killed the mc said it was 랜덤 and someone was cocky and steped on the stage with the thing XD and it used its power which was the hand gun (or something like that) fethers few and everyone was scared everyone got a power so they all whent into their indavidual rooms and a girl punches the 벽 then trys puching the door it didn't work