Kitanai Kimi ga Ichiban Kawaii by Manio — Ongoing

Also known as You're the Cutest When You're Filthy

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From mdex:
Sezaki Airi and Hanamura Hinako. In the class they are in different groups and castes with no interaction, but they have a secret that they cannot tell anyone else. The girls' secret is that of love, selfishness and fetishes....

Volume 1
Chapter 1 released Apr 3 '20 Puking
Chapter 2 released Apr 3 '20
Chapter 3 released Apr 4 '20
Chapter 4 released Apr 5 '20 Navel Play
Chapter 5 released Apr 6 '20 Watersports
Chapter 5.5 released Apr 6 '20
Volume 2
Chapter 6 released Jun 19 '20 Diaper NSFW Spanking
Chapter 6.5 released Jun 20 '20 Exhibitionism
Chapter 7 released Jun 20 '20 Food Puking
Chapter 8 released Jun 21 '20 Blackmail
Chapter 9 released Jun 21 '20
Chapter 10 released Jun 22 '20
Volume 3
Chapter 0.5 released Dec 18 '20
Chapter 11 released Jun 23 '20 Puking
Chapter 12 released Aug 8 '20
Chapter 13 released Aug 18 '20
Chapter 14 released Oct 18 '20
Chapter 15 released Oct 19 '20 Puking
Chapter 15.1: Extras & The Melancholy of Miyazono Ichika released Dec 18 '20
Volume 4
Chapter 16 released Dec 19 '20
Chapter 17 released Jan 18 '21 Moderate amounts of sex NSFW Rape
Chapter 18 released Mar 20 '21 Diaper
Chapter 19 released Apr 19 '21 Biting NSFW Toys
Chapter 20 released May 19 '21
Chapter 20.5 released Jul 17 '21
Volume 5
Chapter 21 released Jul 18 '21
Chapter 22 released Aug 20 '21
Chapter 23 released Sep 20 '21 Moderate amounts of sex NSFW