Ok so from what i understand Ruce didnt want Red to die in battlefield thats why she beat her up so she cannot leave her and go to battlefield and stay with her instead and since she is not good with words and actions everything just go wrong
1. "Kimi to sekai no owari o tazunete - Keep the End" by Koruse
2. "Maitsuki niwatsuki ooyatsuki" by Yodokawa
3. "Kono Yuri wa Fiction desu" by Mucha Ham
4. "Haru tsuzuru, sakura saku kono heya de" by Tokuwotsumu