All Sumire wanted was to enjoy her day off! Koharu, a young woman with powers similar to Sumire's, is back and ready to join in the fun, but her handler's a hotheaded thug who's itching for a fight! With the threat of an all-out brawl building, there's only one thing Sumire can do—settle matters with a brutal, no-holds-barred, winner-take-all game of mahjong!

Volume 4 of the Rai Rai Rai manga series by Yoshiaki.