A world where it has been established that people routinely swing between slightly different parallel worlds... Koyomi Takasaki, who lives with his mother following his parents' divorce, enrolls in a local university prep school. Due to the atmosphere concentrated on studies and his social awkwardness, Koyomi is unable to make friends. One day, he is suddenly approached by his classmate Kazune Takigawa, who tells him that she has travelled from the 85th world where she and Koyomi are lovers.

High school student Ibuki Keita has been haunted by misfortune for as long as he can remember. For no apparent reason, everyone around him dies tragically. Ultimately, he refuses to become too close to anyone, even his childhood friend Akane. This leaves Keita alone in a life full of misery and disgrace. While eating at his favorite ramen shop one evening, Keita meets a strange young girl named Kuro. Possessing abilities that surpass that of a normal human being, Kuro classifies herself as a Mototsumitama. She explains to Keita about "Terra," a life-energy force split between three identical looking people; a global phenomenon dubbed the "Doppeliner System." As a Mototsumitama, Kuro guards the "Coexistence Equilibrium," the beings that protect the flow of Terra around the world. Keita refuses to believe her story, until he is caught up in the crossfire of this hidden world. On the verge of death, he makes a contract with Kuro, unbeknownst to its true meaning. Now he is bound to Kuro, and must be with her at all times. Could Keita's misfortune possibly get any greater?

Tatsuya Kimura is beginning to feel left behind. With his friends Ippo Makunouchi and Mamoru Takamura holding the championship belt in their respective weight classes, Kimura's inability to become Japan's Junior Lightweight boxing champion eats away at him. Scheduled to fight with the current champion Ryo Mashiba, Kimura begins to train with Ippo's rival Ichirou Miyata, who previously suffered a crushing defeat from Mashiba's signature "Hitman" style of boxing. But Mashiba has his own desire to hold onto the belt, hoping to soon shoot for the World title and secure financial stability for his sister Kumi. Will Kimura's overwhelming drive to prove his strength as a boxer overcome Mashiba's desperate wish to provide a better life for Kumi? [Written by MAL Rewrite]

Pride Royal Ivy is the final boss and all-around scum in the otome game To a Beam of Light With You. She committed innumerable crimes—from enslaving her adopted brother in a soul-binding contract to abusing her position against the servants in the household. In short, she is a villain of pure evil. A normal high school student in Japan reincarnates into the eight-year-old body of Princess Pride. The first order of business: survive to see another day. Using her cheat-like abilities, she resolves to save her father, rescue the kingdom, and become a kind and benevolent ruler. And so, Pride resolves to change her fate, no matter what it takes!