Shibu looks through a box of her old stuff. She finds hundreds of nearly identical drawings of her and a mysterious kid: TANTAN. She tries to reconstruct her past to find him, and more importantly, to find out what was lost.

High schooler Kanji Okimoto wanted to beat a horror game. Instead, he decoded a secret message that gave him one month to claim a mysterious object, or die. Joined by his class president Yuki Hatanaka, Kanji discovers a world of magic and dangerous creatures hidden within everyday Japan. But in a...