Overview
Happy birthday (お誕生日おめでとうございます, o-tanjōbi omedetō gozaimasu) is word of congratulations on a birthday.
On pixiv it may be a message to the viewer (mainly the user of the image response destination), or it may be a message to the character depicted or the people involved (such as the original author).
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Happy Birthday! HappyBirthday Happy_Birthday HappyBirthday! Happy_Birthday! HappyBirthday!! Happy_Birthday!!