Naoya Touhara is a human father tricked by a fortune teller into being pulled from his world, Midgard, into the magical kingdom of Alfheimr, where he's told his new job is joining the harem of ten-year-old succubus princess Astarotte Ygvar. Astarotte needs a harem to stay healthy as she grows, but a childhood incident has left her averse to men, so Naoya ends up navigating palace politics alongside his own daughter Asuha while trying to win the princess's trust instead of her contempt. This manga is the source for the Astarotte no Omocha! anime and its OVA.