Astrojensen said: Artists name on Pixiv is 枕河馬亜. Can't read moonspeak runes. Sorry.
According to the Pixiv profile, the equivalent Twitter ID is "makurakabar". (The kanji would actually be pronounced more like "makurakabaa" (まくらかばあ), so it's punning on an an extended "ba" sounding like a Japanese-inflected pronunciation of "bar". Anyway, adding tag.