THE iDOLM@STER ALL-IDOL CATALOG 2005-2016	Published in 2016. A book featuring every iM@S idol at the time of publication, so naturally Hiromi is included! She was unvoiced at the time of publication, so her entry is pretty small. Coincidentally, a lot of the other idols I like were only introduced after this book's release.
	Gekijou Vol. 7	Published in 2017. Features an exclusive GBNS comic. I should grab the other ones with Hiromi comics, but I'm not actually sure which comics are featured in each book.
	SS3A Live Brochure	Published in 2018. A photobook of all the performers at the SS3A live. Saya Aizawa has both a standard short interview and a longer interview in this one.
	SS3A Memorial Book	Published in 2019. A lyrics book with photos taking during the SS3A lives. It came with the BD release, and fits neatly into that box.
	CG 6th Brochure	Published in 2018. Photobook of the performers at the CG 6th live. Saayan has the standard short interview.
	CG 6th Memorial Book	Published in 2019. Photobook with photos taken during the CG 6th live.
	Call Guide (6th)	Published in 2018. My first physical call guide! Katchi got me one when she attended the live. Hiromi is pretty small on the cover, but it's a major milestone, and the design is really cool so it doesn't matter.
	CG 7th Brochure	Published in 2019. Photobook of the performers at the CG 7th live. Saayan has the standard short interview.
	CG 7th Script	Published in 2019. Reprint of the scripts used for the intermission scripts of the CG 7th live. Also included are the comic-style panels that were shown with the skits. It's just stapled together like an actual script, but I expected more with the cost being so high.
	CG 7th Memorial Book	Published in 2020. Was sold in a three book set, but I only got the book for Comical Pops. It's a basic but cute photobook, showing off everyone's live outfits. I liked the bonus pages showing how the live outfits were designed, it was a nice touch!
	CG Live Broadcast 24magic Guidebook	Published in 2021. A non-standard guidebook for a non-standard broadcast. Might have interviews discussing the various segments of the broadcast. Also came with a copy of the board game featured in one of the segments.
	CG Broadcast & LIVE Happy New Yell!!! Yell Book	Published in 2021. What is a Yell Book? I have no idea! The (Google Translated) description mentions that it'll have pictures taken by the cast, which is a cute way to do a photoshoot with social distancing rules in place.
	CG 10th Anniversary Brochure	Published in 2021. Photobook of the performers at the CG 10th Anniversary live. Saayan has the standard short interview. There was a digital-only book published after the live that took the place of the usual Memorial book.
	Minna no Sekichan 2~5	Collaboration Doujinshi published in 2014 and 2015. Through these doujins, you can track the steady growth of Hiromi's fanbase. I'm still looking for the first Minna no Sekichan, which was released in 2013.
	HIROMISM	Collaboration Doujinshi published in 2016. Similar to the Minna no Sekichan series, but with a magazine theme. I followed this doujin as it was coming together, and even wanted to contribute (which did not happen), but couldn't buy it... This was one of the things that motivated me. I'm glad I eventually found it secondhand.
	Koko Kara Hajimeru	Doujinshi by Gouriki Department Store, published in 2016. My first ever doujin, Ned bought me this as a gift!
	jewel Smile	Doujinshi by Sacco, published in 2016. It's a gorgeous little art book. Slash helped me buy this one, and it was my first-ever BOOTH order.
	関裕美再登場記念本	Doujinshi by Sacco, published in 2016. I think this was sent as a bonus for buying jewel Smile, but I honestly can't remember.
	そんなの全然きいてませんけど！？/I haven't heard of that at all!?	Doujinshi by Hanon, published in 2018. The cover for this is incredibly fancy, with a lace pattern cut out of the side and quilt-like paper underneath. It's a cute GBNS story.
	Ato 1cm,	Light Novel by Nogiko, published in 2019. It's about the design of Hiromi's SSR dress. I... can't read it well, but I'll be able to read it in the future and give a better summary.
	Seki Hiromi Notebook of Medicine	Notebook by Nogiko, published(?) in 2019. A blank medical notebook, used to track medical hstory and medications. The cover has patterns based on Hiromi's various SSR costumes. I won't ever use it, but it's really unique.
	私のアイドルは天才かもしれない/My Idol might be a Genius	Doujinshi by Kotoha, published in 2020. A doujin about a female Producer looking back on Hiromi's career in 2019... of course I'd get it.
	Just be yourself!	Doujinshi by Kamado, published in 2021. An artbook by a SekiP, featuring illustrations by other SekiP. Came with a bonus print that I should probably frame, because the paper is a bit thin and I don't want it to get crinkled.