See In Azure · The Price of Happiness Episode 1 / 2
Kyoya, a devoted teacher, finds himself caught in a complex emotional triangle when it is revealed that Yumi is actually a clone created to ensure the happiness of the girl he cares for, Miyu. As Yumi develops her own genuine feelings for Kyoya, the conflict between her programmed purpose and her own emotions threatens her life. To save her, Yumi must undergo a procedure to erase her memories, sacrificing her identity and her love for Kyoya to survive as a blank slate.
