If you're looking for manga similar to Isekai Kunshu Seikatsu (Light Novel), you might like these titles.
A protagonist enjoyed his Isekai life by stubbornly doing everything at his own pace. Abundantly surrounded by misanthropes, he tried to redo his life and have an amicable personality… Let’s leave it at that. When starting over with life, returning to one’s mental age was not guaranteed. Probably.
One day, a witch appears in a Japanese high school and grants the wishes the students wrote in their middle school graduation book. This results in the entire grade being transported to a fantasy world because of somebody's wish to “escape” the world. As the students come to terms with the wishes they made, they have to fight to survive in a dangerous world completely unlike their own.