^ That's what I've been thinking, too. They definitely need an album to cap off the Momoko era.
"Sometimes it seems as though the whole point of the Japanese writing system is to keep non-Japanese people from understanding what the hell is going on." — Dave Barry
To me that seems like the only reason to why they'd have the last single come so early. Leave with an album with a Momo song and whatnot. Would make a lot of sense, really.
I don't understand the science lab scenes paired with the sunday-dresses-at-church scenes, but I'm sure it will become clear with the full version. Maybe. The song continues to be pleasant and those costumes (both) are pretty cute.