The Black-Hearted Marquis's Son Whispers Love to the Supporting Character Young Lady [Extra Edition]

This is a spinoff of "The Dark-Hearted Marquis's Son Whispers Love to the Supporting Role Young Lady ~I Wasn't Just a Hanger-On for This Fluffy-Headed Couple!?~" https://ncode.syosetu.com/n2071ho/ The main story is not being posted here, so reading only this may not make sense. One day, Lieselotte, the daughter of an earl, overhears the true feelings of Cain, the marquis's son whom she thought was the prince's hanger-on, about the farcical drama unfolding at his academy. At the academy, a baroness's daughter who is a transfer student and the prince, along with his circle of followers, repeatedly engage in reverse harem-like antics that border on farce. However, Cain is quite angry about it... After overhearing Cain's harsh words from deep within his heart, Lieselotte ends up entering into an engagement with Cain of his own will. This is a story that takes place after these two have come to understand each other's feelings. It's a loose and fluffy romance between a dark-hearted noble (prime minister's son) as the hero and a heroine who would seem to be a supporting role according to templates. The setting is rather vague. Updates are irregular.