A Crossover Anime/manga Story, the Protagonist is Imprisoned by a Yandere at the Beginning

【Yuno Gasai】brand black tea, one sip and I'm unconscious, a lifetime of imprisonment—On my first visit to my girlfriend's house, I was drugged and locked in the basement by my "yandere girlfriend." Every day, she "pampers" me from every angle, chewing my food and feeding me, changing my clothes herself, even controlling my breathing. "If you dare escape… I'll turn you into a blinking collectible, okay?" I finally managed to escape, only to find the outside world even more absurd—and worst of all, they're now gathered at my doorstep, having a friendly physical exchange!! Who can tell me what to do, surrounded by yanderes?!