It is no small secret that the character designer of the HiME series, Hisayuki Hirokazu, loves loves loves the character of Lena Sayers. She is like his personal mascot, equivalent to how the creator of Shaman King feels about Kyouyama Anna.
So watching S.ifr OVA 1 and seeing just how much detail and emphasis has been put on making her as awesome as possible leads me to believe that he’s having a lot of influence on this particular series.
My-Otome 0 ~S.ifr~ is a prequel to My-Otome detailing the adventures of Lena Sayers Yumemiya, mother of Otome heroine Arika. There’s a few surprises, mainly that Lena is using an activation gem completely different from the one we’re familiar with. We also get to see the previous owner of the gem that Sara Gallagher uses in Otome proper. The animation is quite good, the character designs are strong and sexy, and it’s pretty much everything you’d expect from the HiME series at this point, only with tons of Lena love being poured in.
The other adjective I would use to describe it is “Boobariffic.” Lena has quite a pair of assistants, and it’s easy to see why Arika herself developed so much between Otome and Otome Zwei.