My darkest manga as of now
Here's a summary:
Lunatique is a Great Goddess whose sister died as a weapon against Yomi.Fearing her anger,the other gods of the time sealed her in Nihil,expecting her to die an be erased.There,she met the only prisoner to have survived:the Dragon-God Vritra (Dragon from Hindu Myths) and together,they manage to break out after 50 years (1000 for Vritra) and swore vengeance against Olympia while acting as a monster hunter in Canan.Fights using her Sacred Sword St.Izanami (original goddess in japanese myths) and her laser sword Deicider(deicide=the act of killing a god)