The 'de' series is a small corner of the Namco Original genre, and rarely got any attention though it was good enough to spawn four different songs. Part of why it is is so small despite being one of the oldest song series is due to its nature- each of them is heavily reliant on wordplay and Japanese puns, which definitely are not easy to think of.
The song lyrics of each of them are also full of wordplay (except Desert de Yakiniku, which has no lyrics). The one common feature of all the songs in this series is the word 'de' in between two other words, and 'de' is spelt out in English letters instead of で. Difficulty varies widely between songs.


