"Special offer for four winners per month! Luxury dinner and free accommodation!" To investigate "Blackburn", the mystery proprietor luring participants to his mansion through this strange campaign, you travel to the isolated mansion. However, that night... Blackburn is found as a dead body. The only people in the mansion are you, and the three other winners. Conduct an investigation to discover the culprit and solve the mystery!

"Special offer for four winners per month! Luxury dinner and free accommodation!" To investigate "Blackburn", the mystery proprietor luring participants to his mansion through this strange campaign, you travel to the isolated mansion. However, that night... Blackburn is found as a dead body. The only people in the mansion are you, and the three other winners. Conduct an investigation to discover the culprit and solve the mystery!

—For someone like you, solving a case this small should be a piece of cake, right? You wake up in a room you've never seen before. You have no memory of how you got there. Prrrr… Prrrr… Following the sound of the continuous ringing, you move toward its source—and find...

Ryu and Sen, who live in Japan, join an event "English Puzzle Club" and will solve a puzzle while speaking in English.