Living in a ninja residence tucked away in a corner of a futuristic city is Rikka, the eldest daughter of a Ninja clan, who looks up to her father—a researcher—very much. Carrying on with her life normally, Rikka's home came suddenly under attack one day. Driven into a corner, what would she do to overcome this crisis? Rip darkness to pieces and become "BLACK"!
Set in the same Chichibu city as Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai. its story follows two Aioi sisters, Akane and Aoi, who have lived together since their parents' passing 13 years ago. One day, older sister Akane's ex-boyfriend Shinnosuke Kanemuro, who is 31 now, visits the city to perform at a festival. At the same time, 18-year-old Shinnosuke, called Shinno, also time-travels from 13 years ago. While Aoi starts falling love with the 18-year-old Shinno, Akane and the 31-year-old Shinnosuke finally reunite...
On a hot day right before the summer vacation, all first-year male students of the second class from a junior high school disappear. Was it an accident? A group abduction? In fact, they were hiding in an abandoned factory near the river, and used it as a liberation area to rebel against the adults. The adults are in great confusion by the huge and unexpected operations cooperated by the female students; entangled with real abduction cases, a corrupted mayor election, and even involving parents and television reporters who are thrilled by the liberation broadcast and barricade. The comedy mystery progresses in a light tempo that doesn't give the audience a chance to breathe until the brilliant end that is full of satire.
Yashiro is the young leader of Shinseikai and the president of the Shinseikai Enterprise, but like so many powerful men, he leads a double life as a deviant and a masochist. Doumeki Chikara comes to work as a bodyguard for him and, although Yashiro had decided that he would never lay a hand on his own men, he finds there's something about Doumeki that he can't resist. Yashiro makes advances toward Doumeki, but Doumeki has mysterious reasons for denying. Yashiro, who abuses his power just to abuse himself, and Doumeki, who faithfully obeys his every command, begin the tumultuous affair of two men with songs in their hearts and no wings to fly.