Official accounts of 毎日ヒトコト英会話 (Everyday's "One Sentence English"), a joke English learning website. According to the site's information, it has two main illustrators.

Site name: 毎日ヒトコト英会話 (Mainichi Hitokoto Eikaiwa)
Artists: ゆっきー (Yukkii) and こーちゃん (Koochan)
hitokoto eikaiwa