I'm in Tokyo and Unlock the Door for the Landlady at the Beginning.

Traveling to a parallel world in Tokyo, 90% of the men here were washed away by a tsunami. When Nodōsai first arrived, the tsunami almost swept him away. Fortunately, he survived tenaciously and was lucky enough to activate the system. Through the system, he can master various skills. "Noto-kun, can you help me open the lock?" After helping the landlady open the lock, Nodousai successfully obtained the skill [Lockpicking Mastery]. But what was not good was that the young man felt the landlady's overly intense gaze. "Xiaozhai, please come to my house as a guest in the evening." Nodōsai discovered that the ladies in Tokyo were far more enthusiastic than he thought. As he comes into contact with more and more ladies, the man gradually discovers that their motives are not pure... "But I just want to complete the mission!" Nodou Sai gradually discovered that he could no longer escape the abyss!