Seiyuu connection? Given how the commentary drew reference from ryuuou no oshigoto! and Hidaka Rina being the seiyuu of both Mutsuki and Hinatsuru Ai.
not just that. Sakura Ayane voiced Shimakaze and Yashajin Ai, Ogura Yui voiced Amatsukaze and Charlotte, Kanemoto Hisako voiced Ginko and Kiyoshimo, Kayano Ai voiced Kashima and Keika, Hashimoto Chinami voiced Iowa and Ayano.
not just that. Sakura Ayane voiced Shimakaze and Yashajin Ai, Ogura Yui voiced Amatsukaze and Charlotte, Kanemoto Hisako voiced Ginko and Kiyoshimo, Kayano Ai voiced Kashima and Keika, Hashimoto Chinami voiced Iowa and Ayano.
Now speaking of that... Why I hadn't seen someone drawing Shimakaze playing Shogi yet.