Manga by author Aihara Miki

From VIZ: In company-owned rabbit-hutch apartments live tenants who can't afford to live anywhere else, and the apartment complex in which high-school girl Hatsumi Narita lives is ruled over by the rumor mongering, self-righteous Mrs. Tachibana. Get on Tachibana's bad side, and life becomes hell. When Hatsumi has to buy a pregnancy test because her popular sister Akane's period is late, Mrs. Tachibana's son, Ryoki, who used to bully Hatsumi as a kid, promises not to tell the world about Hatsumi's secret, only if she becomes his slave. Suddenly, Azusa Hatsumi's protector in their youth, reappears to save her again! He's moving back into the neighborhood! Despite the budding romance between Hatsumi and Azusa, Ryoki has control over her through the secret that could ruin the lives of everyone in Hatsumi's family, and he hasn't forgotten who his slave is!

From Day of the River: Sakuraba Junko is turning 27 years old soon, but even so, she is without a boyfriend. But who cares?! Junko has a stable job as an English teacher and she is fine with spending her upcoming birthday alone. Well, until she is set up with on an omiai with a Buddhist monk... which, of course, she rejects. But then he shows up at her school where he has enrolled in private lessons... what will become of our Junko-sensei?

From DGT:Because Yukino's mom is a housekeeper for the Renjyo familiy, she has to suffer the pain of hearing her mom praise the family she takes care of. And this is why Yukino has been trying to beat Renjyo Tamaki for most of her life, so her mom would care more about her than the Renjyo family. But when her mom gets sick, and she has to take care of the Renjyo family instead, her goals change a little.