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Going on with our lives after having lost someone is always painful. What does it mean to move on without forgetting them? This is a story about survivors struggling to find happiness within their guilt and grief. (Source: Manta)
Happy Birthday was originally released as 5 doujinshi volumes from November 18, 2012 to March 2, 2014, and was serialized on Lezhin Comics from October 15, 2015 to November 26, 2015. A new side story was included with the doujinshi compilation volume released on January 7, 2017; this story was included in the Ridibooks release on October 23, 2020. The series was published digitally in English by Manta.
No character information available.