five years ago
Well over a decade after discovering the first dragon egg, Kitajima Yuuri continued her research on New Ogasawara under the employment of the ISDA, a unified Earth space facility that was founded in secret to comprehend and combat the threat of Thanatos and its dragons.
It was during this time that Kitajima was involved in a romantic relationship with Yonamine Kou. While on what was implied to be their first date together (to buy perfume), the pair met Hoshi Nanami, Kitajima's new research assistant. Although hesitant to accept Nanami, Kitajima warmed to the girl after she picked out a perfume for her.