This is a young person who is a parasitic person, a parasite of others, a lawless resident "ヒル", a person who knows the existence of others, and a courageous person who is willing to stand up to a person. The socialist revenge サスペンス. Youth が, なぜヒルが生まれたのか, なぜ比らはsocial から fall ちこぼれてしまったのかを知ることで本shouldの爱に気payき、心の微をtake り戻していく様子がつづられる.