Step!

Riku and Umi, an orphaned brother and sister, have spent their childhood without parents and are now preparing to live on their own after leaving their adoptive family. As they move into their new home, they discover a small boy named Ken inside, despite the house having been locked and inaccessible. Ken appears foreign and is unable to speak. His presence raises questions about how he ended up in the sealed house.

Isinasalin pa — orihinal na teksto sa English.