Sweet Revenge

You peacefully lived with your family in the Seigoka neighborhood. One day your parents suddenly disappeared. They left you a great legacy. You don't need to work even for a day to live the rest of your life. But being only a kid, it meant nothing to you. You are adopted by your neighbor Tondas. Time has passed, and you are an adult now. Try to discover the mystery of your parent's disappearance; While doing so, it doesn't hurt to take revenge for what was done to you while you were young and naive. Does it?