Mention
On this scooter, there's an angel with a drop of sweat coming off of it, because it forgot to mention something to you! It seems like it's something important too, since they're sweating so much.
The angel just visited you, but it forgot to mention something important (probably life-threatening, it's an angel after all), and now you see it scooting at top speeds toward you.
じゅつ
の
None
"I forgot to mention, you have to study ninjutsu (じゅつ)!" the angel yells. But it's too late, there are ninjas jumping out of the bushes around you and taking you hostage.
The angel really should have mentioned ninjutsu earlier. Then maybe you would have gone straight to a dojo to learn instead of falling into a ninjutsu trap yourself. The angel definitely failed its mission.