JPYE is debuting a new gg at least a year ahead of their typical schedule.
There must be reasons why JYPE is rushing.
A good reason is because Twice (or some members) will not renew their contracts.
They will either retire from idol life or try new things (every Twice member already has many millions USD).
Mina already succeeded in life, but there are things she likely still wants to try in show business.
One is the Takarazuka Revue - a prestigious and elaborate musical theater.
Takarazuka is iconic in Japan.
Mina also lives literally within walking distance.
Mina studied ballet since she was very young, which is a common background for Takarazuka performers.
Takarazuka has several troupes and some lean experimental (e.g., Cosmos).
It's common for popular media to affect productions.
K-pop would be one natural source of inspiration.
The top star of Takarazuka, Tsukishiro Kanato, is even a fan of BTS.
Mina joining Takarazuka Revue would be game-changing.
Incredible new energy and international attention for the franchise; a likely childhood dream come true for Mina.
Mina's performance experience in K-pop would translate directly.
She would also fit the profile of certain Musumeyaku roles.
Or Mina could just putz around and be 1337 twitch pogchamp in Prada.