In the latest issue of Attack on Titan, there is a hidden sex gag. Today, the manga's creator Hajime Isayama apologized on his blog. Apparently, he didn't know about it until after the fact.
The manga editor in charge of Attack on Titan explained via Twitter that an assistant allegedly added the gag without Isayama or the editor's knowledge.
On his official site, Isayama blogged that it was not his intent to include the off-colour ditty in the manga -- it seems it was slipped in. That being said, he did apologise for the joke.
"I take full responsibility," wrote Isayama. "The cause was a lack of awareness of my own manga."
"As a result, I let down the people who were looking forward to this instalment, and I think this is inexcusable," the Attack on Titan creator continued.
"I apologise for this, and from here on out, I will be more aware of my own manga so this doesn't happen again and will concentrate on creating better work."
Wonder if the assistant got fired...