Nana’s visit to Kouta’s house is brief, as no one takes her side when she says Nyu is the bad person (referring to Lucy). Mayu takes her duties as new friend seriously by chasing Nana down.
As Nana describes someone Mayu has never seen (the violent Lucy), she admits that it’s strange that she can’t sense “Nyu”, and that it doesn’t feel right trying to kill someone who won’t fight back.
Even after Nana leaves and Nyu comes to, she’s running a high fever that concerns Kouta and Yuka, and wakes up as Lucy. Being cared for in bed reminds her of another time she had a fever, when she was at the orphanage as a child.
While there, Lucy was relentlessly bullied by boys while a girl was always a little too late to stop them, and her only friend was a puppy. She tells the girl about the puppy, and she leaks the info to the boys. You can guess what happened next.
Lucy never wanted to hurt anyone. She was a kind soul who shared her food with a weaker animal. But people around her—supposedly “normal” humans—kept pushing and pushing until she simply couldn’t control herself anymore, and killed them.
After that incident, while burying the puppy the bullies killed for no reason other than to try to make her less happy than they were (mission accomplished), she meets a young boy…named Kouta.
To be continued…