Rosalia-chan, she really thinks that soiling Kiryu's reputation will make him change his mind. It made her sick. Lila could tell that the girl genuinely had feelings for him. She's always said that she can't stop others from liking Kiryu, even when they were dating. It's the same even now. People are free to like who they want; you can't stop somebody from liking another person. People fall in love with the most unexpected person; it suddenly hits them one day. Rosalia-chan genuinely liked Kiryu. But doing this is wrong, she can't allow her to get away with this.
"What do you want to do?"
"Ah," Lila looked into his eyes. It appeared as though Haruka was conflicted. "Did you…"
"Back then, she showed me the video."
Haruka didn't have to clarify when then was. So it was during that time. A deep sigh passed her lips. If she knew sooner, she would have returned home. It's only natural that Haruka told her.
"I'll go back after the third round is over."