on rightclick on sign:
    line 2 of clicked block is "checkpoint"
    line 3 of clicked block is "[rightclick]"
    set {checkpoint.%player%} to location of player
        message "&6 2つ目のチェックポイントを設定しました!"
   if player has permission "skript.admin":
       message "&7Location of player"
on rightclick with nether star:
    cancel event
    if clicked block is sign:
        stop
    if {checkpoint.%player%} is set:
        teleport player to {checkpoint.%player%}
            stop
    else:
        message "&c 2つ目のチェックポイントが設定されていません!"