It's a story about a little Keronian named Nobibi, who is looking for her friends Kiko that was head back to the Earth, the Keroro Platoon is showing the place where they meet her in time paradox.
The Blob has a name Butt Firecracker, it probably a part of this three-eyed weirdo that attacked Keron.
It's a sad story about friendship of Nobita and Doraemon between Nobibi and Kiko.
Keroro Gunsou episode 305
Next up is... I won't tell you! It's a secret! How's that? Ke-Kero!
