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After Drake finally reconnected with his family and the rest of his friends living inside of Fuyu, he had a long talk with Fuyu herself, who was very worried about him as well. She told him that she had been taking care of him since he fell unconscious while using her Slime body to stay with Larzak's tribe, in that conversation he learned about what had been happening lately and go an update in many things with the help of Yuki, Miranda, Benladann, and the rest, who all knew a tidbit of information which all coupled into a whole picture so he could figure what had been happening lately all around the place.
Check "The Protagnist's Sister Is Actually the Strongest"!