Crescent, Althea, and Seir. These three 15 year olds attend Vagrant Academy together, studying to pass their First Class Exam. They hunt giants together and sell their materials so they can save up enough for their own guild house. One day when they were nearly eaten by a Giant Lawolf, a mysterious Knight appeared, and soon they find out dark things are happening in Madrigal.

Featherine Augustus Aurora has abandoned the game of Higurashi for quite some time now, trapping her opponent, Lady Lambdadelta and her own piece, Rika Furude, in a logic error. Now an Incubator named Kyubey from another universe proposes to be Featherine's opponent in this game, in place of Lambda, and he has his own pieces and new elements to introduce to the game!

This story takes place at the end of Saikoroshi-hen, where Rika decides to kill her mother, to return to her world, but the results are not even close to what she was expecting

N has been crowned the King of Team Plasma. He now sets off on his journey to awaken Reshiram and win the Pokemon league, with his sisters, Anthea and Concordia tagging along to help him.