Sonic Channel staff on their blog:
It is Charmy enjoying the Boys’ Day, making use of an origami helmet and a koinobori!
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It is the Children’s Day in May after the spring in full bloom. In this season, there will be lots of Charmy’s favorites and it will be very busy.
Koinobori and helmet mean the Children’s Day. Speaking of the Children’s Day, it’s Charmy!!