Yufuin's inspiration leads the Defense Club decides to go on a training camp to the ocean on . Meanwhile, the three student council members head to a beach resort in a limousine. The beach has bright sun and white sand, but there's something a little off about it. A strange feeling starts hovering around the group's members...
Especially if the criminal 
turns out to be one of us here!
Vor allem, wenn der Täter einer von uns wäre!
¡Sobre todo si el criminal 
es uno de ustedes!
¡Sobre todo si el criminal 
es uno de vosotros!
Encore plus si le coupable
est parmi vous !
Specialmente se si scoprisse 
che il colpevole è uno di noi!
Especialmente se o criminoso for um de nós!