English ain't my mother language, so there might be some weird wording and other translation problems, sorry.

The author was kind enough to share this doujin on their Twitter account a few years ago:
https://twitter.com/suhukit/status/1404008299037478913

For some reason, a few of the pages the author uploaded were on a lower resolution/dimension compared to the rest (specifically pages 11, 12, 17, and 18), so yeah, sorry for the inconsistency, but not much I can do there.

General info about the doujin:
https://www.melonbooks.co.jp/detail/detail.php?product_id=523280

Author's Twitter:
https://twitter.com/suhukit

This is meant to be uploaded on October 1st, which is the birthday of the protagonist of this story: Junna Hoshimi.

Happy Birthday, Junna!