If you're looking for similar to Fire Tripper, you might like these titles. All recommendations are made by Anime-Planet users like you!
When they were just children, the beautiful Azusa, and her cousin the shy Yuzuru were bethrothed. In the present, Yuzuru has long since forgotten this promise, and is happily dating a young woman named Satomi. That is, until Azusa decides to pay a visit and cash in on their past vows. What's worse is that Azusa, spiritually and mentally speaking, is not quite what she used to be. With time running out and sinister forces against them, Yuzuru must protect his love from a newfound evil, or die in the process...