An Unnatural Phenomena
Usagi's Panic: Rei's First Date
Usagi aseru! Rei-chan hatsu deto
"Ami brings Usagi and Rei to her favorite park where the lake and peaceful environment make it a perfect dating spot. Unfortunately, the place is soon to be demolished to make room for an office building. Hearing the news, Rei decides to have a date with Mamoru at the park before it closes down, much to Usagi's annoyance." (source)