Ruroken doujinshi by Sakurakan come in both normal and lemon flavours. The mature books have good storylines and a gentler style than Yamaguchirow. The artist plays with cover stock for each release (details indicated, where known). Scans of some Ruroken doujinshi can be found scattered around the web.

If you know of a Sakurakan KxK release I've missed, please let me know! Assistance in filling in the blanks below is also most appreciated.

Date	Image	Title	Cover	Size	Pages	Rating	Notes
		Sugar Sugar RuRoRuNi Vol. 5		B5			The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU).
Apr 97		I Wish	Reverse gloss color cover.	B5	28	Normal	Kenshin and Kaoru explore their feelings while Sano keeps Yahiko amused.
		Shiawase no Kategorii		B5	~34	Mature
Jun 97		Toriko Captive	Silver on black paper; gold foil title.	A5	48	Mature	Lovely, delicate story featuring an evening with Kaoru and Kenshin. A moody piece, it is a wonderful example of an early work by this circle.
Aug 97		Rousyaku?		B5	~32	Explicit
		Sora no uta		B5	~52
Dec 97		Tokyo Hiori	Coated stock with matte finish, color foil title.	B5	56	Explicit	Kenshin comforts Kaoru, demonstrating his true feelings for her.^^ Also features a romantic interlude when Kenshin accidentally catches Karou in the bath house. [Sample]
Mar 98		Air's Film	Glossy cover, multicolor foil title.	B5	96	Mature	Kenshin is troubled by ecchi dreams of Kaoru. When she is threatened by thugs, he is forced to confront his problem and reveal his feelings. [Sample]
May 98		Ai Hana Yuki		B5	~26	Normal	Two stories, written from each cover. [Reverse Cover]
		Hear the Song of the Wind RuRoRuNi Vol. 8		B5	~40	Normal	The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU).
Aug 98		Kimito Bokuno Machide In Our Town	Mixed-fibre cardstock.	A5	24	Normal	Kyoto arc. Kaoru watches over Kenshin as he recovers from the battle with Shishio. [Sample]
		Aiken	Cardstock. Shiny styrofoam effect.	B5	65	Explicit	Kenshin x Kaoru on their wedding night.
		There Will Be Love There RuRoRuNi Vol. 9		B5	~36	Normal	The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU).
Oct 98		Unemei no Hito		B5	~76		1997-1998 Anthology. [Back cover with contents]
Dec 98		Glittering RuRoRuNi Vol. 10		B5	~48	Mature	The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU).
		Sakura Tsukiyo Sakura Moonlight	Woven-textured cardstock.	B5	100	Explicit	Beautiful doujinshi. Kaoru and Kenshin share some sake on a quiet evening, followed by some more intimate moments. Very ecchi.^^
Mar 99		Prism	shiny styrofoam-effect	B5	52 (4 color)	Explicit	A romantic interlude in the dojo. Printed on a soft green mottled paper.
May 99		I'll Be There		B5	~160	Explicit	Anthology of the RuRoRuNi series. [Contents]
Aug 99		Blue	Textured cardstock, multicolour foil title.	B5	20	Normal	Kenshin x Kaoru express their feelings and hold hands during an outing. [Back Cover] [Sample]
		Darling RuRoRuNi Vol. 11		B5	~124	Normal	The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU). [Selected scans: Tanuki Madness]
		Kagerou Heat Haze (or Mirage)	Cardstock. Subtle floral-like texture.	B5	64	Explicit	The picture used on this cover also appears in monochrome on the back cover of 2817. [Sample]
		2817	Dark green fabric-textured cardstock. Gold foil-stamped title.	B5	28	Explicit	ano... very ecchi.^^ [Sample]
		True Merry Rings	Parchment textured cardstock.	B5	16	Mature	Summer Comiket event-only giveaway, featuring several romantic and humorous snippets.
Oct 99		Please Kiss Me Here	Shiny geodesic textured cardstock	B5	32	Explicit	Kaoru puts Kenji to bed and then retires for the night with Kenshin. Unfortunately, Kenji keeps interrupting them. Kenshin pouts a little but Kaoru convinces him to finish what they started.^^ [Selected scans: Tanuki Madness] (Thank you to J. O'Brien for summary details.)
Dec 99		Sora to Umi no Georama Sky and Sea RuRoRuNi Vol 12 *series finale*		B5	~76 (1 color)	Mature	The RuRoRuNi series is a re-telling of the manga in a modern-day, high-school setting (AU).
		Strawberry Fields Forever	Textured cardstock with multicolour foil stamped title.	B5	40	Explicit	On their wedding night, Kenshin discovers that Karou is even more innocent than he expected. [Back Cover] [Sample]
		Strawberry Fields Forever +wrong side+	laminated styrofoam	B5	48 (4 patchy green)	Explicit	A collection of fantasy ficlets featuring OOC dream/fantasy sequences, including "His Precious Pussy" and "Sadism Syndrome". [Back Cover] [Sample]
Dec 99 ?		The Angel got off the Bus in these Woods		B5	~16	Explicit	Copybook featuring AU sketches of Kenshin & Kaoru playing doctor/nurse. [Sample]
Apr 00		Heavenly Kiss		B5	~20	Explicit
May 00		Nouvelle Lune	Textured cardstock.	A5	88		This is a novel by circle Sakura Mori. The cover art and one small guest illustration are by Seriou Sakura. Rare and very lovely.
Aug 00		Pinkish Sugarberry	Textured cardstock.	B5	48	Explicit	Another wedding night story. Somewhat graphic first-time.
		Chotto Kyuukei A Moment's Rest	Soft textured cardstock.	B5	24	Explicit	Summer Comiket 2000 event-only book.
		Yami ni Ugomeku		B5	~124	Mature	AU - What if Kenshin met Kaoru rather than Tomoe in his Battousai days?
Aug 00 ?		Whited Sepulcher				Explicit	Copybook?
Dec 00		Words	Textured cardstock.	B5	28	Mature	A kitten helps to bring Kenshin and Kaoru together. Sweet and funny love story.
May 01		Yami ni Ugomeku 2	Cardstock. Oilpaint texture.	B5	48	Mature	AU - What if Kenshin met Kaoru rather than Tomoe in his Battousai days?
Oct 01		Caramel Cinnamon Chocolate		B5	~26		Sweet-looking copybook.