When nothing else helps and you're dying for 100 Years straight, get drunk on fine Bernkastel Wine! Nipah~ Sponsored by Furude Rika and the Furude-Shrine! (Disclaimer: You're not allowed to take me (Rika) Home!)
*Keiichi:* If only people could be more honest with each other, it would be easier to overlook mistakes. *Rika:* Keiichi, I drink because I'm afraid to kill myself quickly. *Mion:* Oh, Rika, you're so adorable.
It's "Mangagamer Track 5", Rika's theme from original VN. I tried her theme from Matsuri VN "Baby's Walk" too, but original theme fits better UPD: added link to the video description