The main character was in a research group on Earth and could use magic before being transported to another world. He tried to hide his powers in the isekai world, but was revealed after someone attacked him (it's been a few years since I read it so I'm not sure). He came with other people and was mainly a black and white manga
Isekai manga about a main character who uses math and numbers to cast magic
a random cake
- 31
- 5