Read it like this: 1) Hitomi no Ori 2) Hitomi Dj - Sakayume no Niwa Ran has a dream in which Byakuroku vanishes into thin air and only bones remain. Even knowing it was a dream, he can't just help being worried. Will the dream become reality...?
main story: Yubisaki No Koi ➝ side story: Mawaru Sekai no Kimi to Boku (ch4-Hitomi no Ori) ➝ spinoff: Hitomi dj - Sakayume no Niwa ➝ spinoff: Hitomi dj - Asagi and Uguisu's Situation ➝ spinoff: Hitomi dj - Rin ➝ spinoff: Hitomi dj - Kumo no Ito
Hitomi No Ori --> Hitomi No Ori dj. I liked this one better than the prequel... it's just more romantic than the previous one, which did not show enough love between the 2.
main story: Yubisaki No Koi ➝ side story: Mawaru Sekai no Kimi to Boku (ch4-Hitomi no Ori) ➝ spinoff: Hitomi dj - Sakayume no Niwa ➝ spinoff: Hitomi dj - Asagi and Uguisu's Situation ➝ spinoff: Hitomi dj - Rin ➝ spinoff: Hitomi dj - Kumo no Ito