Heisei Era

"Heisei era" (平成, Heisei Era; HE) is a term used within the universe of Nisshō. It is a time marker to differentiate between the "Pre-Heisei era", which focused on the development of Seitorō Nisshōkirite, and the current era which focuses on Yukine Nagato. 1 HE, would be the start of Yukine's journey to discover exactly who or what he truly is.