Fukushima Prefecture: children under the age of 16 with adult supervision can stay at game centers until 8PM JST, while children that are over 16 but under 18 with adult supervision can stay at game centers until 10PM JST.
Other prefectures: children under the age of 16 with adult supervision can stay at game centers until 10PM.
Miyagi, Saitama, Kanagawa, and Tokushima Prefectures: children under the age of 16 with adult supervision can stay at game centers until 8PM JST.