I married my office lover, and together with my wife Ryoko, we began a new life. After our marriage, Ryoko quit her job and took over the management of an apartment building inherited from my parents. Since we knew our neighbor worked night shifts, I didn't mind much aside from the mud he occasionally tracked into the hallway. But one day, I came home early and found muddy footprints leading up to our front door. Filled with anxiety and dread, I unlocked the door, only to find Ryoko missing. Suspecting the worst, I borrowed the neighbor's key and entered his apartment—only to discover Ryoko inside, writhing in ecstasy. My body trembled with rage and humiliation, yet at the same time, I felt an indescribable, tingling pleasure surging through every part of me.