The 7 Palaces in the game represent the Seven Deadly Sins. In order they are Lust, Vanity, Gluttony, Sloth, Greed, Envy and Pride.
As of 2017, it takes a place among the top 10 user rated games on IMDB, having a rating of 9.7
The persona Arsène is named after the popular gentleman-thief Arsène Lupin, created by Maurice Leblanc.
Shadow Shido's first form bears a resemblance to Char Aznable from the Gundam franchise who was also voiced by both Shuichi Ikeda and Keith Silverstein in both Japanese and English.
There are ten different sequences for the Valentines Day scene. One for each female character you romance, one with Ryuji and a bonus one where you are called out for romancing every female characters at once.