Naomi's Student ID (直美の生徒手帳 Naomi no Seito Techō , lit. "Naomi's Student Handbook") is a key item found in Corpse Party. It is an ordinary student ID card in a blue holder . However, in the live action movie, the ID is a student notebook with a picture of Naomi and Satoshi inside.
This item is eventually given back to Naomi or it will be burnt later in the chapter, depending on if Yoshiki chooses to go back to Heavenly Host Elementary School or not. It contains Naomi's scrap from the "Sachiko Ever After" charm.
During the beginning of the movie, Naomi places her charm piece inside her ID holder, next to a picture of her and Satoshi Mochida. It is later seen when Ayumi notices it on the ground. She flips through the pages and finds the picture and Naomi's charm scrap. Ayumi gets jealous and hides the student ID in her skirt pocket so that Yoshiki wouldn't see it.
Later, while Satoshi, Naomi, Ayumi and Yoshiki are all looking for Naomi's charm piece Ayumi purposely tears out a piece of paper and gives it to Naomi, stating it belonged to Mayu. Satoshi sees through the lie, remembering that Mayu had the head piece, but doesn't say anything. Ayumi is later seen throwing away the student ID and burning Naomi's scrap from the charm.