And the third chapter of the first doujin isn't even here yet... Oh well. I'm happy I'm not the only one who thought of You as a yandere. We all made a joke about Kotori being a Yandere, and putting up love triangles between her, Honoka and Umi but in Sunshine, the love triangle is actually Canon. And we even caught a glimpse of Yandere You. Sadly, things didn't escalate in Canon and they made the Yandere deredere by the end.
I hope this lives up to the OG School Idol Days. And if it follows the same route, that would just be boring. Chika is a hell of a friend, unlike Honoka (trust me. I love Honoka, but her obliviousness before the s1 ending is just unforgivable.) so perhaps Yousoro would end up killing Riko and Chika, overcame with grief, committed suicide. Then Yousoro cradles the body of her beloved, smiling. Until the end of their days.
Their school idol days.