拘束 淫烂授业 女仆们的工作

A relative of Mayu notices changes in her behavior and sends family maid Kana as a transfer student to the same class to watch after Mayu. The school kingpins aim to make Kana a slave, but since they lack any compromising materials, they plan to use obedient Mayu to break the will of Kana. [From vndbreview]