I Wasn't Summoned to Another World, Yet I'm Building a Harem

How did I, a fish that slipped through the net, end up left behind in the real world?

What am I supposed to do? There's the cool beauty who's the school belle and my classmate, my cute and innocent childhood friend, and a meticulous young nurse... Wait, these panties are a keepsake from my childhood friend? Doesn't carrying something like this make me a pervert? The cool beauty is actually asking for my deoxyribonucleic acid. Is something wrong here? The nurse girl is pressed close to me in the dark. Please, I'm not your boyfriend.