Based on the title provided, you are likely referring to the adult isekai series (also known as My Classmate is a Princess Knight or My Slave IS Classmate in some translations). This series revolves around Tōru Odamori , a "Slavemancer" who builds a harem by magically dominating women in a fantasy world, including his former class president, Kirika . Core Romantic and Relationship Dynamics
If you were looking for a different "Classmate" story with actual romantic development, you may be thinking of: Enslavement Magic - My Classmate is a Princess Knight Wiki Download My Sex Slave IS A Classmate PC Game 2003
The relationships in this series are largely defined by a dark, non-consensual power dynamic rather than traditional romance. Based on the title provided, you are likely
: Toru views the women he captures, including village girls and adventurers, primarily as "toys" or tools for his war potential. : Toru views the women he captures, including