That Time me and my Classmate got Reincarnated in Another World
Hikaru Tanaka, a high schooler suffering from severe mental illness and bullying decides to take his life to escape his pain, spending his last day with his half-sister, Hana Tomura. He decided to jump off the high school roof, but, to his dismay, Hana was still there trying to save him, in an unfortunate turn of events they both fall to their death, in the last moments of their lives they hear a voice that speaks of another world and reincarnation. Shortly they wake up in another world, summoned by the Wieka Kingdom to help in the holy war led by goddess Ifrit against monsters, but to everyone's surprise, Hikaru and Hana were reincarnated as monsters. The king himself exiled them from the castle but, in a turn of fate, the king revealed the truth about goddess Ifrit and her plan to enslave and destroy all monsters. The king's last wish before Ifrit brainwashed him is for them to become demon lords and defeat goddess Ifrit.