(Sorry for stealing your Uploader Comment Osipov)

Please support I-Raf-you
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author credits from what I can gather from page 2:

Blue-skinned Senpai by 虫析虫易 (mimizu) https://www.pixiv.net/en/users/186899
2 colored illustrations by 将軍 (Shogun) https://www.pixiv.net/en/users/823302
1 colored illustration by 10電 (10-Den) https://www.pixiv.net/en/users/26615914
4 page story by カイトマン (Kiteman) https://www.pixiv.net/en/users/36758734
2 page full color by ググドド (Gurudodo?) https://www.pixiv.net/en/users/15119032
2 page full color by 二階堂吉一 (Yoshikazu) https://www.pixiv.net/en/users/12435861
4 page story by をすし (O-sushi) https://www.pixiv.net/en/users/81418
2 colored sequences by ひさの (Hisano) https://www.pixiv.net/en/users/17422240
8 page story by matango (mtng on pixiv) https://www.pixiv.net/en/users/85591967
3 colored illustrations by まるまる。 (Maramaru.) https://www.pixiv.net/en/users/105096287
16 page story by めりこ (Meriko) https://www.pixiv.net/en/users/2436585 . . . *I think* . . .

Not sure about that last on, turns out there's alot of artists with that alias over on pixiv.

Base +12, Maikyboy +15, Teapok +5, YamatoKazuya +13, nuts987 +15