Surviving the Demon Realm, Starting with Contracting a Tyrant

High school student Shen Qingyi finds herself bound to a celestial book at the start, along with two teammates who are also bound to death. Her studious best friend handles the output, her desk-mate bully takes the hits, and she is responsible for bringing everyone back alive from desperate situations. Is the demon realm powerful? Is the skeletal tyrant fierce? No problem—she has talismans, a system, and a loyal teammate who always manages to withstand damage at critical moments. But this teammate's gaze towards her is becoming increasingly strange. "Shen Qingyi, do you believe in past lives?" She doesn't believe in fate, heaven, or any twilight of the gods. She only believes in one thing—this life, no one is allowed to die. — Description from novelcodex.org