Blue Blue Tokyo x The Promised Neverland

Blue Blue Tokyo x The Promised Neverland was a collaboration between The Promised Neverland and Blue Blue Tokyo held on August 13, 2021. The collaboration included limited edition watches themed to Emma, Norman, and Ray. All three designs were limited to 300 units each. The back of each individual watch contained a serial number between 1 and 300 to distinguish each watch in each set. The last three digits on every watch are the Grace Field House numbers "194". For example, a watch may contain the serial number "200194" to signify that it is number 200 out of 300 units for that particular set. The lining of the leather belt has the identification number of the character the watch is themed to.