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Japanese cartoon, shy boy receives visitor from the future who will help boost his confidence

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Dear filmfind community, can anyone name this movie whereby a shy boy receives a visitor (like a big white blob) from the future in his room, and that alien helps him overcome his shyness and be more confident in his life?

i think i watched part of this movie onboard a flight a few (but not many) years ago.

victoria7174 Asked question Jan 2, 2021