One night, as meteors streak across the star-studded sky, Shion Pavlichenko becomes a Contractor. Despite her brother's transformation, Shion's twin sister Suou continues to live a fairly ordinary life, attending middle school with her friends and getting caught up in the awkwardness of growing up. However, everything changes when her home is invaded by a masked man cloaked in black, destroying any sense of normality she once had. Revealed to possess latent Contractor abilities of her own, Suou is caught between family, friends, and her own sense of purpose as she ventures into the ruthless world of cutthroats and espionage that Contractors call home. Meanwhile in Tokyo, investigation surrounding Hell's Gate's sudden collapse is underway, and prophetic signs of doom point in the direction of a silver-haired doll. [Written by MAL Rewrite]

Kaiji Itou is a good-for-nothing loiterer who spends his days drinking beer and stealing hubcaps—that is, until he ends up being tricked by his former co-worker. Unable to suddenly repay his friend's huge debt all by himself, Kaiji is offered a shady deal to participate in an illegal underground gamble on a cruise ship. This turns out to be nothing more than the beginning of his new life of hell—thrown headlong into a life-threatening roller coaster of mind games, cheating, and deceit. Based on the first entry of the famous gambling manga series by Nobuyuki Fukumoto, Gyakkyou Burai Kaiji: Ultimate Survivor follows our unlucky protagonist as he is forced to fight not only other people, but also the mysteries of their psyches. Kaiji finds out the hard way that the worst sides of human nature surface when people's backs are against the wall, and that the most fearsome dangers of all are greed, paranoia, and the human survival instinct itself.

When Leoleshea, a dragon god, is accidentally awoken from her sleep within a glacier, she demands this era's very best game player be brought before her. After a year of waiting, she meets Fay Theo Philus, an apostle—a human granted a supernatural ability called an Arise and thus given permission to challenge the gods in games. Fay and Leoleshea realize they share a passion for games, whether it be with cards or a battle of wits with a god. Declaring that she likes this human, Leoleshea allows Fay to call her "Leshea" and team up with her to play in the gods' games. Ever since the gods gave humans the ability to challenge them, they have promised to grant any wish after ten victories. Leshea desires to become an official god again, as she previously descended to the human world and lost her status as a divine being. Fay has only one goal: to find the woman who long ago taught him how to play games. Though Leshea and Fay quickly prove themselves to be a capable team, the gods will not allow them ten victories so easily: every game has its own unique conditions and hidden rules. Together, the duo will have to act as a perfect team to finally achieve their goals.

A peculiar transfer student named Ougi Oshino has just arrived at Naoetsu Private High School. She is quickly introduced to senior student Koyomi Araragi by their mutual friend Kanbaru Suruga, in hopes of obtaining advice regarding a strange discovery she has made. After taking a look at the school's layout, Ougi notices that a classroom has appeared in an otherwise empty area—a place that should not exist. Unsure if this is the work of an apparition, Araragi and Ougi attempt to unravel the truth behind this enigma. But Araragi soon discovers, after finding himself locked in with Ougi, that the room holds the memory of an event he had long since forgotten. [Written by MAL Rewrite]