Despite that it was sung by a bunch of adults In-Universe, the insert song, "Namida no Broken Heart", has some racy sexual imagery in its lyrics about a summer fling...
A teary broken heart from last summer
Your figure... it's sexy
Even if you let me make love
to your bare-naked body
You're so cool about it... I'm mesmerized
- Did we also mention that Takurou Hagiwara, a 12-year-old boy, gets to cover the exact same song on the class 6-1 Image Song album?