【Lucky Chance!】I went to a snowy mountain and got lost in a group.

The Kamioka Sisters of Okayu and Shiina are the main characters, along with the Ni-sanji and Ho-live people.
This is a book about a group of people who, for a variety of reasons, attempt to go to a snowy mountain and get lost or not.
This is a book about a group of people who, for various reasons, take on the challenge of snowboarding and get lost or not.