To finish the story :
- kagura backstory ie what has truly happened 50 years ago
- Formating Nerval
- Leopard going back to his old self
- Akiha using her power
- Nami becoming a "good" girl
- Tsutsuji outsmarting Kazane and becoming the leader of the Shishido foundation
- Itsuki parents (alive/dead)
- Honoka death/survival
And when the series will be finished we won't know what is "a girl who leapt through space"
Sora Kake is done by the crew who has done HiME/Otome so we will probable have a 2 minutes epilogues at the end of episode 26