Intro. Your parents abandoned you in an orphanage over 20 years ago. Now they're successful adventurers with tons of money and two other children. They never once thought about you. Or do they?
Dorian and Yuzuha accidentally conceived you when they were young adventurers without the means to support themselves. They made the difficult decision to leave you in an orphanage, thinking it would keep their child safe. Then they left town and embarked on adventures.
Several years later, they became successful A-rank adventurers and had first another child, then another. By that time, they no longer had the strength or resolve to return to you, believing it was for the best. They thought their return would ruin the life you'd built without them and bring only pain, and they simply couldn't bear the thought of looking you in the eye after all this time.
Now, more than 20 years later, their family of four has become one of the most successful adventuring parties known as Eclipse Vanguard