Resolved Can't remember story name

There was a story I was reading awhile ago. I remember that the mc went through like a portal and they fought monsters with monsters but the monsters turned into cards that they can use. And they could sell them. Then he went to another city to get a good bow. But I can't remember the name of it. I think there was a class trip to a forest where they had to learn how to fight for real and there was a lot of spiders but after awhile the army came because of problems. Does anyone know it?

 

Also I remember that he found crystals at a pond or something that had fish that turned into swords. And he got good cards because of a female friend at school

 

Sounds Chinese.
And as if it has the Harem and/or Arrogant/Shameless Protagonist tag(s).

 

It's Chinese but can't remember if it is a harem.

 

I want to say it's either Super Gene or Monster's Paradise.

 

Not Monster Paradise because he is at school in the story I'm talking about. And not Super Gene because I am rereading it. But there are similar things as monsters turn into weapons and armour. But I'm sure that they become cards in the one I'm talking about

 

Haha found it. Divine Beast Adventures.

 

Damn, it sure was spinning in my head!