The same mystery novels from Yui Kawano who won the 8th university reader award for college literatures and the first place rank to read, from Yokohama Meter, rice-rich starring in Yokohama Meter, Seven came to a population of 2000 stair islands, Stair islands are discarded and all of the island wonder why they came to this island. Living in high school in the island of Sagakusa was a peaceful time, but the situation changes depending on the reunion of Yuu Makabe that is familiar with your young age.