A Fickle Girlfriend

For some reason, I fell into another world four years ago. Now that I'm twenty-one years old, a girl who seems to be from my homeland has come to me. Moreover, all she brings are troublesome matters. On top of that, she's even brought my sworn enemy along, and here I am in my fourth year of settling in this other world, caught up in turmoil and chaos. Please, just give me back my peaceful days!