>>2738455The title of the work is "牛乳一気飲みするとお腹ゴロゴロになるから気をつけろ!" (
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=32875195) Google translate says "Watch out because become stomach rumbling If you drink milk gulp!" which doesn't really help.
Lain also gets sick from milk in this ABe comic (translation here:
https://safebooru.donmai.us/posts/21380) although it's unclear if the milk has gone bad or if Lain is just lactose intolerant. (most Asians are)
