Collaborative Tournament 'Umi Monogatari CUP' Unveiled by Sega NET Mahjong MJ and Umi Monogatari Series Sega has announced the exciting collaboration between their MJ series and Umi Monogatari series, introducing the 'Umi Monogatari CUP' national tournament starting October 6, 2025.

Collaborative Tournament 'Umi Monogatari CUP' Unveiled by Sega NET Mahjong MJ and Umi Monogatari Series #Japan #MJ_Series #Sega_NET_Mahjong #Umi_Monogatari