After a Momotaro assassin suddenly kills his adoptive father, Shiki vows to avenge him. But first, he must learn to control his newly awakened Oni blood.

Uryuu Kamihate aims to enter medical school but finds his new foster home is a shrine where he must marry one of the three Amagami sisters and take over the temple.

When sinister forces threaten the peace of Britannia, a young prince embarks on a perilous journey to save his loved ones and discover his true powers.

Aya moves and starts to attend an all-girls high school in Kyoto. Her first friend is her reserved classmate Miki. After school one day, the committee chairwoman Midori takes them both to an analogue game specialty shop called "Saikoro Club" (Dice Club). There, they start playing a German board game without thinking. Thus begins Aya and Miki's search for fun through the world of analogue games.