Hey, It's That Voice!: The anime adaptation mostly retains the original visual novel's voice actors, albeit under assumed names. Only Hiro's and Kyousuke's voice actors underwent The Other Darrin treatment.
Japanese: So this is what Fia would sound like doing sex scenes as Chihiro.
English: Misuzu can't catch a break, even if she is reborn as Chihiro.
English: For extra fun, the voice actresses for Miyako, Kei, Mizuki, and Yuuko also voiced Nagisa, Ayu, Yui, and Yuiko, respectively — the latter four are all Key/VisualArt's characters just like Misuzu.
Reclusive Artist (in-universe): About three or four people know who Hiro really is, and he writes under a pen name.
Write What You Know: The main characters' hobbies and occupations are suspiciously similar to that of a visual novel developer team's main crew.