It's been announced that Sakanaction will hold an arena tour from April to June of next year. 

This announcement was made on October 6 during the encore of the first night of their hall tour 'SAKANAQUARIUM 2018-2019 Sakanazukan Seminar Zenkoku Hall Tour' at Ibaraki Kenritsu Kenmin Bunka Center. The upcoming tour will kick off on April 6 and 7 at Makuhari Messe and wrap up on June 14 at Port Messe Nagoya. Ticket details will be revealed at a later date. 

Saturday, April 6 - Makuhari Messe (Chiba)
Sunday, April 7 - Makuhari Messe (Chiba)
Sunday, April 14 - Hiroshima Sun Plaza Hall (Hiroshima)
Saturday, April 20 - Xebio Arena Sendai (Miyagi)
Sunday, April 21 - Xebio Arena Sendai (Miyagi)
Friday, May 3 - Hokkaido Prefectural Sports Center (Hokkaido)
Tuesday, May 21 - Osaka-jo Hall (Osaka)
Wednesday, May 22 - Osaka-jo Hall (Osaka)
Sunday, June 9 - Marine Messe Fukuoka (Fukuoka)
Friday, June 14 - Port Messe Nagoya (Aichi)