Heartomics: Lost Count is a danmaku visual novel hybrid. The story is about "Hero", a male protagonist who has lost his memories. He is accompanied by three beautiful girls "Euphony", "Lyra", and "Melody" who aid him in a quest to regain his memories. When a set of memories are recovered the most "memorable" memories are brought to the surface. Danmaku translates into "Curtain of Fire," "Rain of Bullets", and "Bullet Hell".