There’s a dark side to this comic. First, though, the joke!

The comic strip is by But A Jape, whom you can support on patreon. There’s also a whole website for the artist.
Panel 1
[A young man in a blue shirt is introducing two friends, a young man in a yellow shirt and a young woman in a pink shirt, to someone off-panel.]
Man in blue shirt: Hey guys, I’m so glad you can finally meet my new girlfriend!
Man in yellow shirt: Yeah, we’ve been-
Panel 2
[The two friends look shocked and are looking at something off-panel. The man in the blue shirt is holding his hands up defensively.]
Man in yellow shirt: What the hell, dude?! That’s your girlfriend?!
Man in blue shirt: Wait, before you freak out, she’s actually a 900 year old dragon!
Panel 3 & 4
[The view pulls back to show a giant red dragon breathing a torrent of fire. The three people from the previous panels stand in the foreground, looking tiny in comparison. The man in yellow looks unfazed, while his two companions look terrified.]
Man in yellow shirt: Yeah dude, we can see that!
What’s that dark side I mentioned? The joke pokes fun at the dodgy anime tactic of a legal loli. That’s when a character appears to be an underage human but is actually a millennium-old demon, ancient dragon or timeless goddess. It really shouldn’t wash, but it’s still common, even in fairly mainstream shows.