I, Maehara Maki, struggled to connect with anyone during my high school years, finding it hard to make friends. Then, a turning point arrived. A girl named Asanagi entered my life. Despite being clandestinely referred to as the second cutest girl in class by the boys, she chose to spend her Fridays with me instead of her best friend Amami, who held the cutest girl in class title. In the comfort of my home, we delved into the realm of games, watched movies, immersed ourselves in manga, indulged in junk food—pizza, hamburgers—and guzzled cola, carefree and content. To the outside world, we might have seemed a bit messy, but to both Asanagi and me, it was a cherished, hidden time together. (Source: MAL News)

Toto has been dreaming about adventuring with other people for as long as he can remember. Despite his hero title, he still remains without allies due to his timid personality. Therefore, when three women: Ciel, Anemone, and Goa suddenly request to join him, Toto is overjoyed. Unbeknownst to him, they are all assassins assigned to eliminate him! While Toto resolves to protect his would-be killers, the women fight over who can finish off the hero. As Toto remains oblivious of his new party members' true intentions and finds himself passing out every time he gets flustered, the four of them embark on their peculiar adventure into the greater world.

While exploring a labyrinth, Rentt Faina, an adventurer with lots of experience but little to show for it, is killed by a dragon upon discovering its lair. Shockingly, he wakes up to find himself turned into a skeleton, the lowest class of undead monsters. As Rentt fights against the other monsters of the labyrinth, he discovers that slaying them gains him experience towards higher stages of undead evolution—even ones with flesh! With this revelation in hand, Rentt obtains a new objective in his undeath: keep evolving in the hope of eventually becoming a vampire, the highest form of undead that is nearly indistinguishable from human beings. Despite being forced to hide his past identity and monstrous nature under an unremovable mask, Rentt manages to return to a semblance of his former life. Granted shelter by Lorraine Vivier, an elite researcher and retired adventurer, Rentt assumes her surname and starts over from scratch as a rookie. Determined to pursue his childhood dream and become a mithril-class adventurer, Rentt must be cautious not to disclose his new bodily circumstances, lest the adventurers’ guild seek to exterminate the monster he has become.

Ayakashi are strange, supernatural creatures invisible to the majority of people. Though most are harmless, some ayakashi attack humans to devour their life force. Exorcist ninjas are tasked with protecting people from these spiteful spirits. Matsuri Kazamaki is a young exorcist ninja born to a prestigious clan. His childhood friend, Suzu Kanade, is an ayakashi medium—an individual with immense vitality that attracts ayakashi. Matsuri deems all ayakashi threatening and wishes to keep Suzu as far from them as possible, but this clashes with her desire to remain close to them. One day, the pair encounters Shirogane, the King of Ayakashi, who is hellbent on consuming Suzu. As she is about to be eaten, Matsuri comes to the rescue and manages to seal the ayakashi's powers—but not before Shirogane takes revenge by turning him into a girl! Until he finds a way to transform back, Matsuri must adjust to his new, peculiar lifestyle while fighting against hostile ayakashi. Moreover, Suzu is now conflicted about her feelings toward Matsuri—further plunging their relationship into a state of ambiguity.