Card Game de Sekai ga Horobu Sekai ni Tensei Shite Card Shop o Kaiten Shitara, Shuui kara Zensaku Shujinkou da to Omowareteiru

[MangaDex]

 

[Mehfia]

Having read the WN, the battles feel vague with how they happen and end.

Storywise, it's like Cardfight Vanguard but the MC just ends things before they escalate albeit unknowingly.