on rightclick on sign:
    line 2 of clicked block is "checkpoint"
    line 4 of clicked block is "[rightclick]"
    set {checkpoint.%player%} to location of player
    message "&6チェックポイントを設定しました!"
    log "%player% clicked checkpoint sign at %location of player% to "ckeckpoint/checkpoint.log"
    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%}
    else:
        message "&cチェックポイントが設定されていません!"