I liked the first four series as an enjoyable ecchi with good fights. Good, but not that amazing. I went to Shuugaku Toushi Keppuroku with the same expect, but i was really surprised. In fact, at the end of the 40min, I had this satisfying feeling that you get when you watch something really breathtaking.
The OAV is divided in two parts : two fights. I would rather say : Two fucking amazing big fights. They really takes part of my favourite.
While mixing ecchi and martial arts is sometimes boring for many anime watchers, this 'add' to Ikki tousen exactly show the opposite. If you watched the previous seasons, it's a must-to-watch. You can give it a try if you don't know Ikki Tousen I think, there is not so much spoil in it.
