Traveling Through Time with High Technology: Female Agents Make a Splash in Ancient Times

Phantom, a cold female agent from the future, fell into a black hole from a hundred-story building while performing a mission, and traveled to an ancient ancient mountain. She only wanted to find her way back, but after accidentally picking up the talkative Myna, she was deeply bound to this world by the ensuing accidents. When the door to go home opens again, should you cut off your ties and go home, or should you choose to stay in a different world with worries?