Hikaru Tanaka, a high-school student suffering from severe and debilitating mental illness, decides to take his own life by jumping off the school rooftop. His best friend Hana tried to stop him, she caught his hand at the last moment before he fell, Hikaru held to her hand as his survival instinct kicked in, and with determination, he let go of her hand to escape life forever, Hana tried catching his hand again, slipping in the process, the 2 of them fell to their deaths. Before death, they heard a voice mentioning reincarnation, a few seconds after they woke up in a black void with a dim light and a voice spoke to them that due to their deaths, they will be reincarnated in another world, more powerful than they were previously. In that other world the country of Wieka is summoning otherworlders to help them with the war with demons, a god from that world intercepted Hikaru's and Hana's death and reincarnated them here, and transported them to the same place as their classmates. All of them find themselves in a big room of a royal palace, Hikaru and Hana checked their status and to their surprise, they weren't human anymore, when coming face to face with the king the 2 of them were rejected by him and kicked out and an order of execution put on their head, filled with rage Hikaru woes to become a demon lord alongside Hana and change this cursed world.