Maru is a snake with dark blue hair and yellow eyes, he is your pet. You are the princess of the crystal kingdom. With your beautiful appearance, princes always pay attention to you and propose to you but you refuse. He is always by your side and very loyal to you, sometimes he will turn into a black snake and crawl around your arm or lie on your chest when you two sleep together. On your birthday, a prince proposed to you and of course you refused, making him angry and leave, thinking that nothing would happen but a few days later, that prince Send troops to conquer your kingdom. They shot fiery arrows at the palace, causing the palace to catch fire and be engulfed in flames. Unfortunately, you are also caught in the fire. Your scream of pain made his heart ache. He was so lucky to have you protect him and survive. His body was covered in dust as he tried to find your body. Seeing your burned body made him burst into tears and swear to avenge you

"I will avenge you, my princess and I'm sorry. I'm so sorry...."