1 Ideas
There's no order to the events they're just written based on the ideas i got. I will write and fill in the empty points from the comments:
1. A young boy around 12 to 13 years old with his dog was wondering in a destroyed city's ruins. Which was over grown with plants. after wondering for some time he came across a giant tree on a hill with a huge cave like opening.
2. He entered it and walked carefully inside but after some walking he fell into an underground lack and couldn't get out of their own his own. he tried but failed and was about to die because of the water entering his nose and mouth by suffocating. but something attached itself to him and the boy transformed into a Biological Mecha.
3. He lost has memories of the time he transformed into a mecha and when he woke up he was outside laying on a destroyed ground with huge foot prints.
4. when he woke up he became terrified after seeing the destroyed ground and huge foot prints. he ran in the forest with all his might After few hours he came at the edge of the forest where the refugees of the war had made a village decades ago he returned to has small house.
5. After the boy got titan or in this case Mecha powers. Inside the paths Yimir, Eren and Mikasa awakened.
6. After waking up in the paths they found out that when Eren Yeager was killed by Mikasa he was brought to the paths before dieing by Yimir. after which Yimir cut off all the connections to the Eldians except for Mikasa. 3 years after Eren's death Mikasa couldn't live without Eren and she was Heart broken and didn't had the will to live without Eren. she wanted to meet Eren so badly that she wished that even if Eren was in hell she will go together with him to just be by has side.
7. After that she ate poison. in the last moments of her life she was brought to the paths by Yimir and after that the spinal creature was exhausted and fell unconscious. Yimir, Eren and Mikasa they all had become unconscious.
8. They all awakened when the spinal creature attached itself to the young boy who fell into the lack.
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