Both stories are set at a movie theater and have cinema as a main theme.
Also, they both happen in the past.

- Both dramas have the same actress (Yuriko Yoshitaka) as FL.
- They are both stories that involve a mystery and an investigation.

The same kind of vibe, with gangs, territorial fights, and a bit of dark comedy. Also, there is an unsolved crime in both dramas, and the main characters help with the investigations. The main character of both shows have to deal with coming of age matters.

Both are about guys who didn't know each other, and are very different from each other, but because of unexpected events, become friends. Also, in Pu-Pu-Pu, the three boys throw away everything and start working as part-timers while in Beach Boys the two guys leave their jobs and life behind to work in a Hostel. Therefore, I reckon the two dramas are quite similar.