Main protagonist, Yudai Morimura [a.k.a. "Morrison"], appears in Shibuya with a grand plan to accumulate wins at high-rate free games...

It has been a year since the human race was destroyed by an unknown virus that suddenly spread, and three high school girls, Harumi Koharu, Tsukishima Natsuki, and Akechi Chiaki, have been spending their time at school playing games that they could not do before they were born. But then, Koharu finds a butterfly with a plant growing out of a flower bud, and even dogs, cats, and other creatures are growing plants... What on earth has happened to the Earth after the spread of the virus? (Source: Takeshobo, translated)

Osaka Tsutenkaku University is a prestigious PR70 school. Yoshinari Takagi, the captain of the Mahjong Club, a unique institution at the school, puts his entire intellect, strength, luck, spirit, and guts into the game of mahjong in this drama full of soul! (Source: Kindai Mahjong, translated)