speculation
sumirepanther made a post way back detailing retirement dates with last-appearance-on-calendar dates. Now that we've gotten more retirement info, it's interesting to see how they match up:
Shirahane Yuri : April, retiring end of May
Aran Kei : April, retiring April
Toono Asuka : April, retiring April
Hizuki Hana : May, retiring beginning of July
Yamato Yuuga : June, retiring beginning of July
This leaves Asako, since I think most of us agree Hanagumi and Mizu are "safe" for now.
Sena Jun : December, retiring ?
My prediction: Kiriyan and Ai-chan [take over] in August.
Shirahane Yuri : April, retiring end of May
Aran Kei : April, retiring April
Toono Asuka : April, retiring April
Hizuki Hana : May, retiring beginning of July
Yamato Yuuga : June, retiring beginning of July
This leaves Asako, since I think most of us agree Hanagumi and Mizu are "safe" for now.
Sena Jun : December, retiring ?
My prediction: Kiriyan and Ai-chan [take over] in August.