Idol Days Sim Date is a girl's love simulation game which Pacthesis released on August 5th, 2010.
You can play the game here.
Idol Days Sim Date tells the story of Lexie (renamable player's character). Lexie just moved to South Cigam in search for a band to join. She then bumps into a blond-haired boy, who compliments her guitar. He tells Lexie to follow him as he runs off. Lexie arrives at a recording studio, and a boy named Emerson greets her. She learns that the blond kid's name is Cody and the other boy's name is Zane. The three of them are in a band named Sistehcap.
When Lexie joins the band, she has 30 days until her first concert with Sistehcap.
For cheat codes, go here.