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Not a lot of people know that one of the most talented and ruthless Mahjong players in the city is a young high school boy. Kei is a teenager of few words, but his observation skills, unwavering will and experience in the game allows him to survive in a world full of powerful, rich and dangerous characters. Kei is currently hiding a girl named Amina who has entered the country illegally and protecting her from being deported. He spends his days sleeping through class and his nights playing high-stakes Mahjong, waiting for when a worthy opponent arrives.
Kaiji Ito is as pathetic a person as they come; a man who gambles his days away, only winning enough to lose significantly more. He hates himself, is riddled with envy for others, but is ultimately too weak to think of a way out of his massive debts. Then one day he is approached by a strange man who offers him what seems the solution of a lifetime – to take a short journey on a ship called Espoir, during which time he will be given the chance to win more cash than he can dream of in a card game like no other. Ever the desperate, Kaiji takes the gamble of his life; however, the game turns out to be far darker than he expected and the hard lessons pile on thick and fast. Now stuck in a closed world of unsavory characters willing to do anything to destroy him, can Kaiji gather enough courage to outwit them all?
After being evicted from her family home, Nashiko Jippensha discovers that her father’s old mahjong club has fallen into disrepair. Determined to bring it back to life, she sets about renovating it with her two friends, Pai and Izumi. Between fiery games of mahjong and moments of relaxation over tea and sweet delicacies, the three young girls transform the club into a veritable refuge where they can blossom.
High school student Katagiri Yuichi, who values friendship above all else, enjoys a fulfilling life with his close friends Sawagiri Shiho, Mikasa Tenji, Shibe Makoto, and Kokorogi Yutori. However, after a particular incident, they're dragged into a debt repayment game. The only way to beat the "Tomodachi Game" is to not doubt their friends. Bound together by solid friendships, the game should've been easy, but– The hugely popular comic that sold over two million copies is finally becoming an anime! Will they trust or betray their precious friends? The true nature of humanity is exposed in the ultimate psychological game!