The Torn Picture Book! The Tragic Secret!

One night, Kiseki sees the Embryo fly past him, but thinks it was just the moon. When Ikuto sees the Embryo the next day, he realizes that it is attracted to other eggs. Later, Kiseki tells Miki about his encounter with the Embryo, but Ran who was lisening misunderstands and starts a series of telephone-like retellings.

Synopsis excerpt via Kitsu.