An upperclassman to the main characters (it is jokingly noted that she was a third year in the main characters' first year and is still a third year when they move up a grade, implying some sort of strange manga time, as she is adamant that she isn't repeating) . Reina is romantically interested in Naota, who seems to reciprocate. She always has a small tiger named "Rawr" on her shoulder.
A Level 7 Burst Linker, fourth-grade schoolgirl, fire-elemental fighter, and another ex-member of the Elements.
A first year High-school student. An ordinary high school student..That worries about her curly and non-blonde hair. She always try to stick herself with Ruka. Tomboyish attitude and short-tempered, Fuuka would take up any challenges. She realized that she fell in love with Ruka early in the series. They became a couple in the last chapter
Ren Kosaka is actually Kai's real father who had died in a gun shot. Kai had seen who shot his father, Hal's father, but it was actually a man beside him. Ren was a member of the NARC and was incharge of the "switch" case. But after his death, the case was completly colsed and everything that had left as evidence for that drug had disapeared. The documents were burned and every person related to it had died.
A beautiful, high-ranking courtesan who has a hairpin that looks just like Hana's cell phone accessory. She also has some relation to Rennosuke. At a young age, her marriage to Rennosuke was arranged which she willfully opposed. Instead, she developed feelings for the son of a samurai family, Kiyomasa. But the difference in their social statuses gave the relationship slim chance of ever coming to anything. When her home suddenly burned down, leaving her with nothing but debt, she decided to go work in Yoshiwara. Rennosuke and Kiyomasa attempted to stop her but she insisted, so Kiyomasa gave her the hairpin to remind her of him. Upon going to Yashiwara her engagement to Rennosuke was canceled.