Misery seems everlasting in Miyo Saimori's life. Born into an arranged marriage, she was quickly discarded after her mother's tragic death. Her father remarried, and her younger half-sister Kaya received all the affection, while Miyo was degraded to a lowly servant. Lacking the strength to fight against her family's abuse, Miyo loses hope that her luck will ever turn. Unexpectedly, Miyo's father summons her to deliver surprising news: she is to marry Kiyoka Kudou, the head of the distinguished Kudou family. Despite his noble background, Kiyoka is known to be a callous man who has thus far dismissed all of his former fiancées. Upon arriving at the Kudou household, Miyo expects coarse treatment and to be tossed aside. However, contrary to her assumptions, Kiyoka shows her the kindness and love that she has desperately needed. Marrying Kiyoka may be Miyo's one chance to break free from her neglectful family and embrace a life of happiness.

When it comes to the fantasy MMORPG Cross Reverie, none can match the power of the Demon King Diablo. Possessing the game's rarest artifacts and an unrivaled player level, he overpowers all foolish enough to confront him. But despite his fearsome reputation, Diablo's true identity is Takuma Sakamoto, a shut-in gamer devoid of any social skills. Defeating hopeless challengers day by day, Takuma cares about nothing else but his virtual life—that is, until a summoning spell suddenly transports him to another world where he has Diablo's appearance! In this new world resembling his favorite game, Takuma is greeted by the two girls who summoned him: Rem Galeu, a petite Pantherian adventurer, and Shera L. Greenwood, a busty Elf summoner. They perform an Enslavement Ritual in an attempt to subjugate him, but the spell backfires and causes them to become his slaves instead. With the situation now becoming more awkward than ever, Takuma decides to accompany the girls in finding a way to unbind their contract while learning to adapt to his new existence as the menacing Demon King. [Written by MAL Rewrite]

Listless geek Mizuto Irido and introverted nerd Yume Ayai seemed like a match made in heaven, connected by their mutual love for literature. Unfortunately, their differences gradually grew, and they separated just after their middle school graduation. But, as if by divine comedy, the two find themselves reunited as step-siblings. A rivalry begins to brew between the former couple, both unwilling to acknowledge the other as the older sibling. In an attempt to "solve" this issue, Mizuto and Yume agree upon a rule: whoever crosses the boundaries of siblinghood norms loses, and the winner will not only be called the older sibling, but also get to make a request. However, now that they live under the same roof, the lingering memories they share start to influence their actions—possibly rekindling the feelings that may not have been fully extinguished in the first place.

An adventure in another world with cute girls by your side and video game-like powers—sounds like an anime fan's dream, right? Not so for melancholic author Osamu Dazai, who would quite literally prefer to drop dead. Video games haven't even been invented yet when he gets yanked into another world in 1948. Really, all the fantastical adventure he keeps running into is just getting in the way of his poetic dream of finding the perfect place to die. But no matter how much he risks his hide, everything seems to keep turning out okay. Follow a miserable hero like no other in this cheerfully bleak isekai comedy!