@MavB_Ver Google Translate says the series is called "Sister who comes to do not do cool thing at midnight" (which is not a sentence) and ikenai on normal Google comes up with bad, so again, how is eating bad/not cool?
@Shewy92 Eating super late/right before bed is seen as unhealthy (bad for digestion), so I could easily see that being how it's "not cool" and especially how it's viewed as bad, potentially.
Man, these kind of manga lately are so misleading. I expect lewds, I get fluff. One of these days, I'll want fluff and I'll get lewds. How frustrating.