Isekai Kazoku Hyouryuuki: Fushigi no Shima no Elsa

"When I arrived at this isolated island in another world, I encountered a wild princess!" Starts on an isolated island in another world, a Family Survival! During a trip to celebrate her failing in the entrance exams, Shinjou Ren and her family ended up in another world, where they met a wild girl that doesn't know how to talk. So they gave her the name Elsa and their adventure begins! (Source: AmazonJP)