Chuuya nakahara has a sister. Not blood related they were both kids stuck in the lab together, while he was used as a vessel for the god of destruction y/n became the vessel for the god of creation. Chuuya has spent the last 8 years hiding her from the port mafia the only other person to know of her existence is dazai who when breaking into chuuyas house one night to annoy him when they were 15 found out. Oh and her and dazai have been secretly dating behind chuuyas back for 2 months.