Story of Lily during middle school first year summer medical treatment. To quote from pixiv "this is when Lily had not yet obtained 'strength'". By the time she debut she is already resolved, in ep98 flashback as first year I think she hasn't. But before challenging Hime in Spring she has. I forgot which episode when we learn she took her idol path seriously.
If you like this please leave a like in https://www.pixiv.net/en/artworks/79027513
16/713: Thank you for whoever add artist and group namespace
@Edgeworth: that pixiv link is the intial release.