Artist patron site: https://fantia.jp/fanclubs/7219 and https://enty.jp/decoyen
Pixiv: https://www.pixiv.net/member.php?id=82301

There's a basic introduction to the Magical Student series here: https://e-hentai.org/g/1235006/6d446f4bb0/
Asuka appears in the following doujins:
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=62964910 (West 1)
https://www.pixiv.net/member_illust.php?mode=medium&illust_id=67040890 (West 2)

-DESCRIPTION-
(info collated from google translate)
Asuka is a 17 year old magical girl who goes to the same school as Yuko (the "West" school, where students are typically equipped with weapons to make up for poor direct combat strength). She's good at staff combat but seems to be lousy at every other aspect, including physical strength. She magical transforming item is probably those weird floating headphones around her neck. She can't get pregnant in her magical girl form but is vulnerable in her normal form.

-CONTENTS-
(all guesswork from google translate)
p1-3: cover and character sheet
p4-14: Excerpt from West 2, where she gets violated by a giant spider.
p15-18: A "what if" story where she is found naked at a hot spring by spider humanoids.
p19-20: "seniors" attempting sexual assault.
p21: Asuka's magical girl form falters, leaving her in costume as a powerless normal girl.
p22-24: Unknown sketches.

OTHER CHARACTERS:
https://e-hentai.org/g/1235006/6d446f4bb0/ (Character Guide)