I really respect this manga but I have some questions. At points it seems illogical.
Questions:

What did they mean by the mother descending?

What was the point to the cop with the mole being a saviour? How was this in anyway relevant to the overall prophecy?

Explain what purpose did the virtual world have? Why would they send the highest ranking students in tomodoachi land inside friends brain? It didn't seem like they were getting brainwashed inside his head How is this anyway productive?

When the students are in the virtual world, why do they freak out whenever they see friends face? I just don't understand what's so crazy about it?

What was the lie of 1970? Is it that he lied that one time in the virtual world saying the events happened in 1971? Did it have to do with friend being a phony? Why did Manjoume want to hide the life of 1970 so much? And why in the world did the virtual world switch the second time Koizimi went in to the correct time period?

6. This has to do with 21st century boys.

What was the point of the bomb in the base when Friend v2 was already planning to destroy the world with the viruses from the alien ships? Also why would friend get control of the remote for the robot that the twins made? Why couldn't they have taken better care of the thing?

SOMEONE PLZ ANSWER D:

bump

A late answer but i will answer you:

You didnt understood "Friend" at all.

Please reread the last 3volumes, all is very clearly explained.