Zero One SP is an adventure game for the Game Boy Advance centered around Nagoya, who experiences strange dreams. During a drinking party with classmates, they encounter eerie piano music at their school. Players navigate choices that lead to one of four distinct and fantastical endings, each revealing a unique mystery behind the haunting melodies.
Nagoya always suffers from mysterious dreams. One day he is invited by his classmates on a drinking party to celebrate the last day of semester. They hear piano playing at night school. Depending on actions, the mystery can have four absolutely different and often fantastic reasons.