Amy's Fantasies, by Csware, has been ported over to the States by Himeya Soft. Amy's Fantasies is a comedy erotic adventure game where you play the part of Emi as she quests to find her one true love, Tomomi.
You play the part of Emi, a high-school girl with a very strong love for her younger step-brother (your father married his mother after both of you were born). She finally decides that it is time to confess her love to him, since it is near her 18th birthday. But, before the climactic moment where you can confess your love, debt collectors arrive to confiscate your fathers properties, and Tomomi goes missing! And this is where the game truly begins.
Amy's Fantasies is an Adventure game, published by Himeya, which was released in 1996. It is considered an adult or Ero game.