After ending the battle against Zolgia, Basara regains his peaceful life with his two little sisters, Mio, the daughter of the previous demon lord, and Maria, her little sister who's also a succubus. As Basara pursues the preparations for the sports festival at school, one day he's attacked by a person being manipulated by magic. Recalling the strange gaze he felt at school, a suspicion of his begins to grow...
Since you have a sports festival,
Ihr habt euer Sportfest,
¡Como comenzará el festival deportivo, 
debes comenzar a juntar energías!
¡Pronto comenzará el festival deportivo, 
debes comenzar a ganar energía!
La fête sportive approche, 
il vous faut donc du consistant !
Dovete mettervi in forze 
per il festival dello sport!
Já que o festival de esportes está chegando,
vocês vão precisar de bastante energia!
Спортивный фестиваль на носу, 
нужно побольше сил набраться!