On September 17th 2017, Michishige Saho announced via her official Twitter account that she will be demoted as a member of Houkago Princess, and continue as a Houkago Princess YOUTH member from September 27th, on-wards. Staff have yet to release a statement on the matter, but the decision seems final.
From June 3rd, Michishige Saho had been undergoing a 'Study Period' as a member of Houkago Princess, where she would only attend various events subject to availability. She would attend all Team Miracle events that were planned out, however, her performance as a Regular member was very sporadic, to say the least.
This decision was made by both Saho and staff members to try and maximise her abilities, and to improve herself so that she could keep up with the other Regular members. However, due to what may staff's interpretation of a lack in progress, it has now been decided that Michishige Saho will be demoted, and no longer perform as a Regular member of Houkago Princess.
Her final performance as a Regular member will be on September 26th, which is also the Birthday LIVE for Kojima Mayumi, who will turn 22 years of age. Saho has expressed that it is a good occasion to spend her last live as a Regular member, as it is a stage of celebrations.