I personally think that the theme of OOO is about desire and greed

The monsters in it are all called greeded, which directly translates to greed, and every time the monsters are like humans. Isn't greed related?

So I think the truth should be "to be content" or not to be greedy

If you are too greedy and don't know how to be satisfied, you will only want more and more. , then you will not be happy, because there will never be enough

And when you are too greedy, you will easily do bad things. If you want to get other people's things, you will be jealous, hate and then grab them

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Dian-O is about time and courage

Dian-O’s story mainly revolves around Ryotaro and the people around him

Because time was disturbed by the alien demon (the monster in Den-O), Ryotaro’s sister’s lover (Mr. Sakuraba) disappeared

And Ryotaro’s niece in the future (that is, his sister and The daughter that my lover was going to give birth to in the future) also lost her parents and later turned into a girl who will never grow up (囧The relationship between these people is very complicated)

So the principle of Denou is probably " "Cherish time and the friends/people around you", right? (Probably)

Because Ryotaro often misses Mr. Sakuraba with the pocket watch left by his "brother-in-law"

And a group of people possessed by him Ryotaro's kind-hearted alien initially started to help Ryotaro because he didn't want to wander forever in the endless but stuck time space

As for courage, maybe it should be said to be hard work

The protagonist Ryotaro is a A weak and very unlucky person (even Sakuraba Yuto said so)

But he still fought hard to protect everyone, and he succeeded in the end

So Den-O Another truth is probably "hard work can overcome difficulties"?