Kimagure Orange☆Road OVA

Kimagure Orange Road OVA is an extension of the TV series.

Order to view with the TV series:

White Lovers - among the episodes 35 and 45
Hawai Suspence - among the episodes 17 and 25
I was a cat, I was a fish - among the episodes 17 and 30
Hurricane Akane, the shape-shifting girl - among the episodes 20 and 25
Spring is for Idols - among the episodes 23 and 30
Birth of a Star - Right after "Spring is for Idols"
Unexpected Situation - after the OAV of Akane
Message in Rouge - after the episode 48

(Source: AniList.co, edited)