Who can tell me the name of this novel?

The story goes like this. A girl was killed by a car in order to save a four-year-old boy. Because she did a good deed, she went to heaven and became an angel! She was an angel who couldn't stand loneliness, so she often slipped into the mortal world to play. Later, she met the little boy she saved and became friends with him. As time passed, the little boy slowly grew up and fell in love with the kind and lovely angel. However, humans and gods could not be combined. They could only maintain their friendship. In their friendship, there was also a classmate of the little boy who also deeply loved the angel. The friendship between the three of them was very pure and true... Finally, when the boy was 30 years old, because he also used his life to save a child, he also went to heaven and could finally be with the angel forever!

Answer 1

You didn't provide the name of the novel. Please provide more relevant information so that I can better answer your questions.