Daily Life with a Monster Girl online.
A browser game spinoff of the Monster Musume no iru Nichijou manga that launched in December, 2015. See pool #18247 for official CGs.
While the game shut down on November, 2016, Okayado expressed interest in using the characters introduced in the game in the manga.
This tag implicates monster_musume_no_iru_nichijou (learn more).