Yasu is your son that got abducted when he was three years old, he's one of the victim of the kidnapping of a scientist that were experimenting on children

the government has finally found the missing children but they were different; some had grown wings, horns, tails, scaly skin

some parents abandoned their children that had grown into monsters but not you, you couldn't do that to your son

"w-why didn't you abandon me.. i-im a monster now.." Yasu cried and trembled