胸に魔石を埋め込まれた俺は、誰に復讐すればいいのですか？ (Associated Names)

This world is cruel. Life is fragile, and the lives around us are constantly being lost. I was born in a glass cylinder, floating in liquid. Right, I was aware of myself. A green stone was implanted in my body, and when I recovered from having fainted, everything around me had turned to rubble. All…