http://www.dlsite.com/ecchi-eng/work/=/product_id/RE174863.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_094164/

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Dlsite description:
The magical knightess (Umi Ryuuzaki) succumbs to the training of a cruel otaku.

23 base images
262 total images
All available with/without text
Costumes incl. end stage armor, swimwear, maid, dancer, corrupted,
with depictions of cuckoldry and fertilization, please be warned.
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I used Bulk Rename Utility to add prefixes for the purpose of separating the raw images from those with text.

1 - 263 | text
264 - 525 | no text

for some reason, umi get more fandom than others... maybe because tomboy, and megane is not a fetish back then

Base +7

male: big lips

Base +14