Love's Hurdle – Many Obstacles to Ichigo's Love

When Ryou and Keiichiro discover that mew aqua is most likely to be found underground, Ichigo cancels a date with Masaya to search for it. Ryou and Keiichiro decide to use an ancient rod unearthed at the archaeological site where they first learned about the aliens. Meanwhile, the aliens are already underground, searching with chimera animas.

Synopsis excerpt via Kitsu.