Lightning's End (Season 2, Episode 18)

Lightning's End is the eighteenth episode of Mushishi Zoku Shou.

Synopsis
Multiple lightning strikes have been observed hitting the same tree, and Ginko investigates. He meets a strange boy who attracts lightning to himself due to a Mushi's influence. His mother believes he is doing it to spite her and struggles with the fact that she doesn't love her child.

Plot
A boy was born unwanted because his mother was married to a man she didn't love. She wanted to marry another, but her mother ignored her wish.

So the pregnant woman attempted suicide because she didn't want a child from a man she didn't love, she understood she wouldn't able to love the child either. Her husband managed to save her, and the woman gave birth to a son. He was struck by a lightning once, when his mother left him tied to a tree in the garden, although he cried and asked for mercy. He was then infested by a lightning-consuming mushi and Ginko attempts to help them.