It was Melissa who sent Yurie to her Bad End.
You see, Chahine's story is one of students in an academy for psychic Duelists, but early on Yurie isn't capable of controlling her ability to manipulate plants yet. Melissa ends up becoming her rival in part due to being the complete opposite: staggeringly tall, painfully thicc, and with great skill using her paint-based ability.
In this what-if scenario, Melissa beats Yurie into submission, ties her up in her own hair, and screws her up for fun before selling her off as sex slave. In true bog-standard hentai fashion, Yurie quickly ends up mind-broken, until eventually she goes berserk and destroys the locale with her psychic powers. Tthe following night, when Melissa comes back to see how was it going, Yurie ambushes her among the rubble and gives her a taste of her own medicine.
