Characters from the artist's series "Gal no OnePet":

Mizutani Momi みだよ/水谷最美 (not sure if the characters are correct)
Mamoru Hikawa 火川護 / Moru-chan モルちゃん

Part 1 Japanese
Part 2 Japanese
Part 3 Japanese
Part 4 Japanese
Part 5 Japanese
Parts 1-5 Japanese

Translations:
Parts 1-4 English Translation
Part 1 Italian Translation
Part 1 Chinese Translation
Part 2 Chinese Translation
Part 3 Chinese Translation
Part 4 Chinese Translation
Part 5 Chinese Translation

Please support the artist if you enjoy their work!
https://atyumuti.fanbox.cc/posts/3165400
https://www.patreon.com/posts/reindeer-momi-60246133

https://www.dlsite.com/maniax/circle/profile/=/maker_id/RG13315.html
https://book.dmm.co.jp/author/248190
https://www.melonbooks.co.jp/circle/index.php?circle_id=9902
http://www.atyumuti.com/p/blog-page_2158.html
https://lit.link/achumuchi
https://www.pixiv.net/en/users/121862
https://twitter.com/atyumuti