A collection of Sailor Moon doujinshi featuring Haruka & Michiru.

In "Sweet Soul Revue," by Miike Romuko, Haruka brings some cake over to Michiru's place, and they fool around.

"Drifting Off to Sleep…" by Yuukawa Risa focuses on Haruka's thoughts about Michiru's sacrifice in the middle of the third season.
Akasaka Arika's "Season of Endings" deals with Haruka and Michiru's regret that they can't be with Sailor Moon.

In "Losing and Finding Things Everyday," by Etou Atsuki, Michiru and Haruka talk about their future.

In Matsukaze Satori's "Sortilege," Michiru thinks about her dreams.

Komedawara Gonzaeko's "How Many Times Must I……" is about a tender moment between Michiru and Haruka.

In "Where the Wind Is," by Oowa Takumi, Haruka explains to Makoto and Ami how kindness can in fact be cruel.

In "Messiah," by Ginga Natsuka, Haruka reflects on her own personal Messiah.

In "Holiday," by Tenoh Saya, Haruka finds a motorcycle and decides to fix it up. (Note: The end of the story refers to a "part 3," but there was never one published in the Crystal Planet's Haruka and Michiru anthologies. If one exists, it is in one of the artist's own doujinshi.)

Links to The Doujinshi & Manga Lexicon:
Volume 1
Volume 2