The story is set in the early 21st century with the population decimated by bio terror. Two kinds of humans now exist. One is the Nokusu who were infected with a virus but survived and consequently they carry an antibody. Most are young, healthy and have high intelligence, but they have a high sensitivity to ultraviolet rays and are active mostly during the night. The other group are the Kyurio. They survived by never having the virus. The Nokusu discriminates against the Kyurio. Tetsuhiko Okudera is a Kyurio. He was born in a poor village. He isn’t happy with being a Kyurio and wishes he could be a Nokusu. Yui Ikuta is Tetsuhiko’s childhood friend. She tries to revive the poor village.

Based on the best selling manga, Haruna Nagashima (Ito Ono) devoted herself to softball while in middle school. Now that she is in high school, Haruna believes its time find a boyfriend. Unfortunately for Haruna, she didn’t pay attention to trends and is now clueless on how to attract a boy. Through a fortuitous event, Haruna encounters popular upperclassman You Komiyama (Junpei Mizobata) Haruna asks You to teach her how to become attractive to boys. You agrees but with one catch. She can’t fall in love with him …

The year is 2XXX and Keiko Town is an over-industrialized stretch of blackened factories pumping out thick layers of smoke that cast it in a perpetual state of semi-darkness. The citizens of Keiko Town fare no better and walk around their dilapidated town in a stupor of hopeless despair. In an abandoned factory in an obscure corner of town lies the secret base of Hikari Club. The teenage boys of Hikari Club despise the adults of their community and have taken it upon themselves to eradicate what they perceive to be the evil and filth of the grown-up world. To accomplish this, they build a machine with artificial intelligence and dub it “Litchi”. However, with the boys on the cusp of puberty and turning into adults themselves, their own world has begun to collapse around them.