Boys' Love Novels What a waste! Kadokawa Ruby Library

Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.

In exchange for a huge debt, Hyuga is shocked when his older sister gets engaged to his first love, Keigo.
However, her older sister suddenly disappears, and Hyuga lives with Keigo instead as a housekeeper.
However, Keigo looks like a gentle prince, but he is a profligate tyrant, and he is hopelessly incompatible with Hyuga, who is extremely frugal.
One day when they were engaged in a battle that did not yield to each other, Hyuga was found out that his first love was Keigo, and he was treated with an evil prank?
The Love Battle where the unobedient tyrant × the pure boy live together (?).