This work is the sixth and most recent installment of the MURDER MISSION series by Takiya Nozomu! The MURDER MISSION tagline seems to have been dropped itself, but it's the same line of doujins. Doujins 3, 4 and 5 are still missing and tracking them down will probably come down to the artist doing a reprint or being lucky and stumbling upon a reseller. Apologies in advance if the title seems wrong!

Artist's Pixiv: https://www.pixiv.net/en/users/588355
Doujin's Pixiv Page: https://www.pixiv.net/en/artworks/116749328
Artist's Twitter: https://x.com/sheepdogs_nt

Toraana: https://ec.toranoana.jp/tora_r/ec/item/040031139122/
Melon Books: https://www.melonbooks.co.jp/detail/detail.php?product_id=2340545

Thanks to Super_Shanko again for scanning this doujin!
https://x.com/Super_Shanko