Hotarubi no Tomoru Koro ni (蛍火の灯る頃に When the Fireflies Glow) is a manga written by Ryukishi07 and illustrated by Koike Nokuto. It was serialized in Gekkan Action from March 25, 2016 to February 24, 2018 and was later collected into 4 tankobon volumes.
A prologue was released as the short story The First and the Last Gift, which features characters from Umineko no Naku Koro ni.
Volume List 
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| Vol. | Cover | Release Date | Chapters |
|---|---|---|---|
| 1 |  | September 12, 2016 |
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| 2 |  | March 11, 2017 |
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| 3 |  | September 12, 2017 |
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| 4 |  | April 12, 2018 |
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