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Kazuto Tokino lives his tranquil life attending high school by day and running the family bath house by night; but his peace is all set to change. One fateful day, the Beautiful Princess Valkyrie crashes her spaceship into Kazuto’s public bath, killing the high-schooler outright! In order to revive him, Valkyrie gives the teen half of her soul, with the unfortunate side-effect of reverting the princess back to a child in both body and mind. Now the young Valkyrie is moving in to the bathhouse and, with her brash sister Hydra and over-protective catgirl maid Sanada following close behind, it seems Kazuto’s peaceful life is long behind him…
After dying in a fight against the forces of evil, a knight found himself reincarnated as one of the most powerful monsters in the world: a behemoth! Problem is, he has to grow up before he can really strut his stuff, and a baby behemoth looks an awful lot like…a housecat?! And when an elf adventurer decides to take him in, she may need his help as much as he needs hers!
Due to being pressed for time by her work day after day, Elfie - a member of the Elf Clan - has a ever-decreasing number of friends and no boyfriend... But after finally having enough of that situation, she explodes with dissatisfaction. "I want to get married!!" Just after her desperate cry for help, a flower she had decorating her room transforms into a fairy, and tells Elfie how she can be happy... And that's to "go marriage hunting and get married!" Following the fairy's advice, Elfie starts participating in all kinds of marriage hunting activities, but will they really work out well for her?!
In the world of Eluveitie, elves and dark elves have been warring since ancient times. The one thing that could tip the balance for either side is a half-elf child born from the nameless Earthling main character's seed. This is a tale of the drama and tragedy of the battle for one generic harem lead's baby batter.