Hasegawa-sensei was a script writer for OAV 1 and specifically wrote the final version of episode 3 and 5. K-sensei didn't like the changes she made to those scripts and so once OAV 1 was done, she was off the project. So, she went and wrote a series of spinoff novels (not manga) where she told her own story of the events after OAV 1. She is the one who created the character of Kiyone Makibi (though K-sensei did the character designs). Those non-canon spinoff novels proved very popular in Japan and so the 2nd movie was made from one of those novels (as I understand it).
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