Summary
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Square Enix is selling copies of Roxas' diary from Kingdom Hearts 358/2 Days.
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Most of the pages have a post from Roxas at the bottom of the page, written during gameplay.
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They are exclusive to Japan at the moment but will hopefully be available elsewhere soon.
There are a lot of games that people are hoping we'll hear more about in 2025, and at the top of the list is Kingdom Hearts 4. It'll have been three years since the next Kingdom Hearts game was revealed in April without much else. told about it then. At least fans of the series have been spoiled with merch since then, and while a release date isn't imminent, more merch is coming this summer.
Square Enix shared a first look at a Kingdom Hearts desktop collection on social media which will be released on June 28, 2025although pre-orders for all items are already available via Square's Japanese store. The place in the collection is a copy of Roxas's Diary, not only because it is a copy of the one he uses in the series, but because of the amount of detail that has been put into it.

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Most Kingdom Hearts fans would have been happy enough with a journal that looks exactly like the one Roxas uses in 358/2 Days to write down his thoughts and feelings. However, this physical manifestation of the book goes a step beyond that. There are diary entries from Roxas everywhereprinted on the base of selected pages as if they were written during the game from which the diary is taken.
Roxas' diary from 358/2 days is real
Read what he had to say each day before adding your own posts
The entries take up about a quarter of the pages they are included in, giving you the rest of the page to fill with your entry, perhaps inspired by whatever Roxas has written that day. While the diary lasts for 358 days, just like the game, there don't seem to be entries from Roxas on every page. There are time jumps in the game, and the pages covering those time jumps have been left blank.
Plus, Square's new Kingdom Hearts stationery collection includes a monogrammed pencil case, notebooks based on Disney-themed worlds you visit in the series, and even Kingdom Hearts masking tape. Everything in the collection is exclusively available through the Japanese Square Enix store for now, but hopefully it will be released in the US and elsewhere eventually. Square tends to be pretty good at it, often adding items to its US store shortly after they appear on the Japanese one.

Kingdom Hearts 358/2 days
Do you like your heroes with impossibly spiky hair? Do you have a penchant for classic animation? Stylish with a key blade? Then prepare for KINGDOM HEARTS 358/2 Days on Nintendo DS! Immerse yourself in the world of KINGDOM HEARTS, where Disney and FINAL FANTASY characters mix with epic results – where creatures formed from corrupted hearts are the enemy and the emotionless “Nobodies” are the bodies left without a heart…