MRXD-019 Mom, you see... I belong to Takaya from your class... Haruno Yui

My mom was a beautiful, intelligent, and hardworking woman. One day I brought home a classmate of mine, 'Takuya-kun.' Unlike me, who is timid and introverted, Takuya had tanned skin and a broad chest, giving off a slightly delinquent vibe. Sometime later, Mom started acting strange. Lately, I've been thinking that something's off with Mom... Even so, I was living my life as usual. But one evening, I caught sight of Mom gasping for breath as Takuya trained her…!