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

There's a basic introduction to the Magical Student series here: /g/1235006/6d446f4bb0/
Miri appears in the following doujins:
/g/891015/a617ab447d/ (Magical Student Alice 6)
/g/1226838/68e8b31685/ (ImpactSwing)

-DESCRIPTION-
(info collated from google translate)
"Milli (15) ... Junior combination 2. It is difficult for him to fight properly if Yuuko is a classmate, his ability is a defensive system and must not partner with someone."

Miri is trained in kendo and as such is able to defend herself to some extent even as a regular girl, provided she has a weapon available.

-CONTENTS-
(all guesswork from google translate)
p1-4: cover and character sheet
p5-7: Excerpt of Magical Student Alice 6 (linked above)
p8-11: Events of Magical Student Alice 6, a bad end for Miri. mos noted that they are all getting pregnant here because they are being raped in their normal forms.
p12-13: Miri valiantly defends herself as a normal girl, but is overpowered and violated
p14-16: Yuko and Miri captured by the "shower caps"
p17: Yuko and Miri out shopping.
p18-19: Excerpt of ImpactSwing, linked above. Miri fights a slime monster with a baseball bat.
p20-25: "Caught in Public" with Yuko
p26: Miri's magical girl form falters
p27: Miri and Miyako tied up.
p28: defeated by a mob, saved by Yuko
p29: Almost raped
p30-33: Unknown sketches.

OTHER CHARACTERS:
/g/1235006/6d446f4bb0/ (Character Guide)
/g/1283259/ea309a2b3b/ (Aoba)
/g/1263354/8f2a30c457/ (Asuka)
/g/1256909/4896705cd4/ (Yuko)

@nosedigger

The detailed post is very appreciated, the series is much more appealing with understandable context.

Base +6