source from south-plus, bought and uploaded by Crestina,

raw:https://www.dlsite.com/maniax/work/=/product_id/RJ262680.html

EP1:https://e-hentai.org/g/1493060/ea9a09f7fe/

EP2:https://e-hentai.org/g/1495212/f02e49146b/

EP3:https://e-hentai.org/g/1495213/71817ea306/

Crestina:

把同伴女学生变成一个会说话的屁股的第2、第3部
第三部里一个学妹发现女主变成屁股，居然自告奋勇说自己也要变屁股

The 2nd and 3rd episodes for the converting your female classmates to be ass which can talk(???)
The 3rd episode is about your female Kohai told you she wished to be an ass too, Jesus Christ!

Thank you Crestina for uploading the CG I can never imagine why someone will buy that.

Buy the original product to support the artist, and as soon as possible, because there is 50% discount off until 10/07 14:00 Japan time, thank you!

Cover and sample CG:p.1-p.6

Previous Episodes Previews:p.7-49

Text:p.50-p.115

No Text:p.116-158

光 荣 洞

Base +1

did they return to normal in the end?

Base +5