Bakumatsu Rock: Mystery! Onsen Kaijiken ze yo!!
幕末Rock 湯煙推理劇[ミステリー]! 温泉怪事件ぜよ!!
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Bakumatsu Rock: Mystery! Onsen Kaijiken ze yo!!
An incident has led to someone's death at Teradaya, which the gang went to for a day trip. A "69" on the victim's leg will be the key to solving the mystery.