Related tweets: [1] [2] [3]
They are the result of this Japanese twitter hashtag: #リプが来たキャラごとに今思いついた描く予定なんてひとつもない漫画の一コマを描く (#I'll draw the I-don't-have-any-plans-to-make-this-(web)comics-at-all panel of the each character from the replies to this tweet)