Mao, Vol. 17 (manga)

As more is revealed, our friends grow ever closer to the secret of who really killed Mao’s first love, Sana. Then, another lost relic from the Goko Clan’s treasure house turns up—the terrible Box of Monstrosity. Mao and the gang pursue the box to free its victims and save lives, but others want to get their hands on it for nefarious purposes…