Oh yes ladies and gentlemen. This is a momentous occasion. The Kase-san anime Twitter page launched a trailer featuring for the very first time Kase-san and Yamada speaking!
As a reminder Kase-san is voiced by Ayane Sakura and Yamada by Minami Takahashi. IMikawa is voiced by Ibuki Kido. Ayane and Minami sing the theme song (Thanks LuzeriP). Will update this trailer once translations are released.
The Kase-san OVA will see a theatrical release in Japan this June. Dunno when it will be made available for purchase to the public though.