Jokes aside, I'll go for Eternal too. I can't see Cosmos. Really, I can't.
Mamoru
dies as a human the moment Galaxia rips out his Crystal. Right. So
how on earth is King Endymion still alive in the future, welcoming Small Lady? And
even more importantly,
how is Chibiusa still alive? If Mamoru dies as a human,
Chibiusa should be as lifeless as the other Senshi of the 30th century!!! And one more thing. If Usagi dies in the cauldron (we literally see her body disintegrating),
how on earth is Sailor Cosmos alive and having a nice long chat with the Sailor Quartet? The fifth arc of the manga feels like it was written by a 5-year-old. Sometimes I think Kodansha gave Takeuchi a break and called in one of the young readers to finish the story.