[Hentai RPG] Saya the Exorcist
Only someone with big breasts and "the power of motherhood" can exorcise spirits.
Saya is such a person, so when a powerful demon is unleashed, she's compelled by duty
and as a bounty hunter to deal with it.
Requires RPG Tkool VX Ace RTP (free):
http://www.famitsu.com/freegame/rtp/vxace_rtp.html