Straw

Before the start of the Manga:
 
Basically, it's revealed that there was some sort of war on Earth, leaving much of the Earth ravaged and covered what seems to be a desert. There is an orbital space station with 800 people still remaining on it, and they decide to finish building the orbital elevator "to save everyone." (Who the everyone is - either the 800 people on the station, the potential survivors on Earth, or both is left ambiguous.) Kud's parents are on the station, and due to dwindling resources, having children is forbidden. However, both Kud and her brother are born, and Kud's parents are forced to send them to Earth on "the last working [escape] pod." The pod crashes (one of the parachutes fails), and Kud's parents believe that both their children had died in the crash. Kud's parents (and, implied, the rest of the orbital station) continue work on the orbital elevator (the construction of which is apparently mainly automated.)
 
It turns out Kud survives the crash, but her brother is killed, and she seems to be rescued by (unseen) adoptive parents. It seems that her adoptive parents named her Kudryavka as a reference to the Russian dog Laika, the first animal to orbit the earth in space. Kud's adoptive parents most likely lived in the town on Topside - a society that according to Radio, was aimed at continuing the construction of the space elevator. The town is abandoned eventually, as they feel the orbital elevator can never be constructed. A new city develops below - inside of the tower. This is the city that both Plane and Radio are from. However, Kud remains on topside. What happens to Kud's adoptive parents is unknown. 
 
Fast-forward to the beginning of the manga:
MC (Plane/Yugo) climbs to Topside in order to make his plane. He meets Kud and later Radio. Radio is on topside because, as she explains in chapter 4: "I want to pick up where they left off. I want to know where this tower leads. I want to see it finished with my own eyes." Radio believes that if she can make contact with the orbital space station, all of her questions can be answered.
 
Radio first hears the Alien Radio - aka Kud's biological parents in orbit - after Kud saves Plane from falling from Topside. The transmission tells Kud to leave the tower and indicates that they are watching her from the orbital station. While Plane sends a message (via some zipline thing) to his friends at the base of the tower, it seems that Radio has set up a projector and screen and begins playing the "optical disc" that she found earlier. Radio heads to her radio transmission booth, and Kud and Plane watch the "movie," which seems to be a home video of Kud's adoptive family. Radio then announces to the city in the base of the tower that the orbital elevator will be completed soon (based on the "Alien Radio" transmission she heard), while Plane figures out that 1) Kud is from space and 2) that the "straw" that Kud references is the space elevator. Plane, Radio, and Kud eventually travel to the crash site of Kud's pod and discover the death of her brother, and the deep emotional attachments she has for the tower, the crash site, and Topside.
 
The "alien radio" then asks for Plane to evacuate the city in the base of the tower - which he does by going and talking to "Pops." Pops explains that all of the "men" knew this day would come, but losing their home and city is clearly a traumatic event. Pops also asks Plane to save Kud.
 
The second third of the manga seems to be the key to the cipher of the 2/3. A lot is explained and contextualized. "Alien radio" explains that completing the orbital elevator will "breathe new life into our dying civilization." The city at the base begins evacuating, and Plane returns to Topside. Radio and Plane discover that Kud has disappeared, and Radio believes that she plans on killing herself. Plane claims that "she'd never do that," but I can't seem to find any other reason for her to stay. Plane, with the help of Kud's parents via "alien radio," finds Kud at what seems to be the connection point for the two parts of the elevator. Plane promises to save Kud with his airplane, and the tower begins to be connected with space elevator. Radio, in the meantime, is climbing back down the tower to the base in order to escape. When the Space Elevator connects to the tower, the elevators (normal elevators in the tower used to travel from the base to the top of the tower) begin functioning again, and Radio attempts to take the elevator the base. Topside collapses through the top of the tower and into the city at the base, and Radio's elevator goes into a free-fall and crashes. However, the destruction of the tower is halted; Plane and Kud speculate that it is Kud's parent who have stopped the destruction of the tower to allow for Kud's escape. Radio is saved by Plane's two friends, who need to take an emergency elevator on the outside of the tower in order to escape. The emergency elevator works, and thus it's implied that Radio is able to escape. Plane and Kud then attempt to fly the plane from the tower - presumably, the issue of the engine being not powerful enough doesn't matter, as now all the plane is being used for is to escape the tower. The final page shows Pops and the evacuating people a fair distance from the tower. Onko climbs a dune and exclaims "A plane!" This statement, combined with Pop's statement of "It's starting again," imply that Plane and Kud have successfully flown away from the tower and that the destruction of the tower has started again.
 
Whether or not Kud meets her parents, whether the elevator even works, or whether Kud's parents lived is left unanswered. However, it could be safe to assume that Kud, Plane, Radio, Pops, the people of the city, and the people in the orbital station are all alive at the end of the manga. Within the greater narrative of the world, this story is very much a end of the beginning - as the second page of the last chapter indicates - the completion of the orbital elevator will "change everything." If Kud's parents return to Earth is the traditional nostos narrative, the events of Straw is the Telemachy.
 
I haven't done a reread of any of this, so I'm sorry if there are spelling issues or grammatical issues!

So, the orbital elevator (straw) crashes through Topside and the town, in which everyone evacuates? Where did Ratah(Radio) end up? What about Kud's parents(Alien)? Why is 12 not in color? They came down from the elevator right? Is there a synopsis I can read somewhere for more clarification?

Oh. Bandaged Kud and big Yugo are actually the parents. I think.

Her having minor brain damage does make some of this make more sense.