A 20-year-old shut-in is suddenly transported from his apartment, only to appear in front of a goddess who offers him a second chance at life. Although she grants him overpowered magical abilities in this new world, when he awakes as the newborn Prince Reinhardt, his talents are only measured at Level 2. Thinking their child to be an abysmal failure, his royal parents abandon him in the woods. There, the prince, who names himself Haruto, encounters Flay, a Flame Fenrir who decides to devote her life in service to him. Haruto's relative, Gold Zenfis, meets them both in the woods and decides to adopt the child as his own. Nine years pass with Haruto under the care of the Zenfis family. His mastery over his overpowered barrier magic increases by the day, though Haruto would rather not use it to help others. He practices his magic in secret, preferring to have his family believe that he is weak. However, his younger sister, Charlotte, discovers his strength, and with the assistance of Flay, Haruto protects her and the rest of the Zenfis family from harm. With a shifty plot stirring in the kingdom, Haruto only wishes to stay inside and watch anime, but it seems he will have to use his magic to keep the family that took him in safe.

On his way to a convenience store, Kazuya Shiina tries to defend two young girls from an armed assailant, only to end up getting stabbed himself and dying on the spot. This good deed allows him to be reborn with all his memories in another world as Cain von Silford, the third son of a margrave. When Cain turns five, a baptismal ceremony in the church grants him an audience to the seven gods who preside over the world. Not only do the gods fill him in on the circumstances of his reincarnation, but they also give Cain their respective divine protections—allowing him to use cheat-like abilities in swordsmanship, magic, and many other aspects. With these blessings, Cain sets out to live a fulfilling life that he deems a dream come true. However, it soon becomes clear that the gods have more plans for him than just a haphazard bestowal of overwhelming power.

While in search of his precious friend, a young boy named Nai falls captive to a beautiful woman, whose looks are matched only by her taste for human flesh. Meanwhile Gareki, a clever thief, is in the midst of robbing her luxurious home. After causing a distraction, Gareki agrees to help Nai escape, but they are discovered upon the woman's return. As she transforms into a ghoulish monster, the boys flee. On the run, Nai and Gareki are found by Circus, a government defense agency that deals with criminal activity too difficult for the police to handle and protects civilians from varuga—terrible monsters that devour humans for sustenance. In the hope that it will lead Nai to his missing friend, he and Gareki decide to join Circus. On their perilous journey, they face dangerous varuga and begin to uncover the secrets behind a shadowy organization known as Kafka.

Kind-hearted Himuro-kun is unfortunate: when in deep concentration, stressed, or flustered, he involuntarily creates blizzard conditions for himself and anyone in his vicinity. During one such incident on the first day of his new job, Himuro-kun encounters the beautiful Fuyutsuki-san, who helps him break out of his nerve-induced ice. As it turns out, Fuyutsuki-san is his new coworker. At the office, the cool-headed Fuyutsuki-san offers simple and rational solutions to Himuro-kun's icy dilemmas—everything from helping him garden without freezing his plants to ensuring he does not melt during their tropical work retreat. Every time Fuyutsuki-san does something kind for him, the tempest of emotions he experiences inside embarrassingly manifests on the outside. As a result of the frequent snowstorms, Himuro-kun's feelings for Fuyutsuki-san are impossible to hide. Even though Fuyutsuki-san is unfamiliar with love, Himuro-kun remains determined to repay her kindness and warm her heart in any way he can.