Tsubaki, a hard-working SE, spends her days competing with her cocky younger colleague Kirisaki. One night, they have to stay overnight in the office together to deal with an emergency! In order to nap efficiently, they slept together in the only bed available, but she accidentally touches Kirisaki's chest. When Kirisaki points out her defenselessness, she replies, "Even Kirisaki-kun wouldn't play around while he's at work." But that made him suddenly hugs her tightly... "You mean I can do whatever I want to you now, before work starts, right?" She wanted to resist, but she can't stop the pleasure...

(Source: Renta, translated)

Notes:
- Originally published under the full title "Toshishita Douki wa Ijiwaru de Ichizu: Watashitachi, Shigyou Chokuzen Made H Shitemashita…"
- A vertical comic version with 18 chapters was simultaneously released alongside the traditional format.
- Chapter count includes an extra from the volume release.