What 排球入门指南 is
A simple volleyball game made by a member of a school volleyball team, built to give you a feel for the sport. The point is to show how passing and spiking work, and to introduce different kinds of attack modes. It plays out as a 2D arcade-style experience with a minimalist look, linear progression, and opponents that each have their own characteristics. Along the way you get a good number of background pictures to play against.
Playing it together
The game is tagged as singleplayer, so you work through it on your own. Remote Play Together is supported, which means a friend can join your session from their own setup. That is the way to share it with someone in your group: one person runs the game and the rest come in through Remote Play Together. Keep in mind the core design is built around a single player, so expect the shared session to follow that structure rather than a separate multiplayer mode.
Before you start
There are 6 different game modes to work through, so there is room to keep trying things after the first session. If you have never played volleyball, the game is meant to walk you through the basics of passing and spiking before throwing varied opponents at you. The tags describe it as casual, arcade, and linear, so the flow is straightforward rather than open-ended. It is a good pick for a group that wants something light to run in the background while someone takes the controls, or for anyone curious about volleyball who wants a low-pressure way to see how the sport plays.