This one gets you with the punchline before the plot: the last heir of a demon-slayer bloodline is allergic to cats, and the bakeneko sworn to protect him won't stop draping herself over him. Himari drawing Yasutsuna in full kimono, cat ears out, is the shot the whole show is built around, and it earns it more often than the genre deserves. The early episodes track the manga closely enough that the Ayakashi hunting Amakawa blood actually feels like a threat before the harem paperwork arrives: Rinko fuming as the childhood friend who was there first, Kuesu strolling in with a marriage contract, Shizuku the water deity, Lizlet the teacup made flesh. Nobody's pretending the stakes hold up. The fanservice is the engine and the plot is a passenger. But if you liked Kanokon or Nyan Koi and wanted the sword fights to actually land, Himari's steel is sharper than her rivals'.
Yuuto Amakawa thought his life was ordinary until a protective charm his grandfather gave him shatters, releasing Himari, a cat demon bound to guard him. She's beautiful, fierce, and absolutely will not leave his side, no matter how awkward that makes things. The real problem surfaces quickly: Yuuto carries demon slayer blood, which puts him squarely in the crosshairs of vengeful spirits and Ayakashi looking for payback. Himari can fight, but one guardian cat demon might not be enough against the supernatural threats closing in. What starts as comedy and romance quickly shifts into genuine danger as supernatural enemies converge on Yuuto's ordinary life. Water spirits show up uninvited, rival demons complicate everything, and the body count of bizarre encounters keeps climbing. Himari remains his most loyal ally, though their relationship constantly walks the line between protective partnership and something harder to define. Action sequences balance out the constant comedic chaos and romantic tension as Yuuto figures out what it means to be caught between the human and demon worlds, whether he wants to be or not.