I think Poppo lost his core group of friends when Menma died and he seemed to be really attached to Jintan. So him traveling as a way to cope is a good theory and using their old base keeps him close to what he once had. He was so happy to see Jintan and it appeared genuine. I can't wait to see more of his character. He made me smile every time he came on the scene even before we saw the mature version of him.
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