The Scarlet Shadow of Lust (Minazuki Satsuki)

After infiltrating an enemy mothership, Shin is seduced and sexually assaulted by the captive women Miki and Katsuragi under enemy surveillance, leading to an escalating orgy where her resistance collapses. In the aftermath, revelations expose that the entire conflict arose from a major familial misunderstanding involving Shin's mother, a stepdaughter, and two new family members. The spaceship is repurposed as a lunar defense base as the characters process their new family ties.