In the second chapter of No Sleep for Kaname Date, time is running out as Ota races to rescue Iris, who’s trapped inside a mysterious box located in the hot spring. Near the end of the chapter’s puzzle sequence, it’s revealed that the box is a Kotoribako—a deadly mechanism requiring only a code to complete its fatal ritual.

With Iris unconscious inside, Ota and Date must collaborate to solve the Seal of Death puzzle on the exterior of the Kotoribako. To progress, you’ll need to interpret the clues and use the Uncurse Note at your disposal.

Mementos Appraisal System Puzzle Walkthrough

Once you’ve unlocked the lockers using the colored light code, inflate the air mattress to create a platform. This allows access to the Memento Appraisal System on the far side of Iris’s enclosure. Input the code shown above to unlock the three drawers marked with a circle, square, and triangle.

You’ll have obtained a newspaper clipping detailing the disappearances of three girls. Your task is to pair two items in each drawer based on the article’s clues, matching the items to the correct girl and placing them in the order the girls are mentioned.

• One girl vanished after basketball practice.
• Another went missing while caring for a baby.
• The third case involves a girl with a connection to a spiritual relic.

The correct item pairings for the Mementos Appraisal System are:

• Circle drawer: Workout Shorts and Taped Finger Model
• Triangle drawer: Umbilical Cord and Ring Finger Model
• Square drawer: Magatama Necklace and Basic Finger Model

Once all drawers are correctly filled, the puzzle advances to a numerical challenge—key to finishing Chapter 2 of No Sleep for Kaname Date.

Solving the Seal of Death Code

After learning the box is a lethal Kotoribako, you must return to the locker puzzle. Iris managed to send a clue before losing consciousness: a black square on the locker grid. Head back and interact with the fifth locker in the second row (second row from the top, far right column).

This action reveals a numeric keypad and displays the code that would complete the ritual and kill Iris. But your goal is to save her, so you’ll need to use Ota’s Curse Breaking Note to activate his Third Eye and uncover the true solution.

Focus on the symbol above the keypad—this is the Seal of Death referenced in your notes. It features three shapes: a square, pentagon, and diamond. Keep these in mind as you examine the Curse Breaking Note.

The puzzle’s instruction says to find the numbers surrounded by the Seal of Death. The trick lies in flipping the Uncurse Note over in Ota’s inventory.

On the back, you’ll see a map of the bathhouse with numbers 1 through 8, each enclosed in a distinct shape. The note tells Ota to enter the numbers in order from closest to the sun, which is illustrated in the bottom-left corner of the map.

However, the real key is this: the shapes in the Seal of Death symbol (square, pentagon, diamond) appear around certain numbers on the map. But instead of entering those, you must find the three numbers that are surrounded by the ones in those shapes—as if framed by them.

This requires lateral thinking. Look closely: the numbers within the Seal of Death shapes form a triangle that encloses other digits. The solution becomes clear when you realize the answer lies in the central numbers enclosed by that triangular arrangement.

The correct code to stop the ritual and free Iris from the Kotoribako is: 1, 5, 3.

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