Douluo, I Promise You to Fight Until the Last Moment

[Single female protagonist, single female protagonist, single female protagonist! "Little Meng, listen to grandpa..." "Well, grandpa, I'm listening." "Don't fight a battle you can't win." "Okay, grandpa, I promise you." … "Grandpa, I promise you." Huang Mengsheng's eyes reflected firelight, flesh and blood intertwined, and countless monsters rushed towards him, "I promise you, I will protect this world."