Set in a dark fantasy world inspired by Norse mythology and Celtic culture, the game follows Senua, a Pict warrior who must make her way to Helheim by defeating otherworldly entities and facing their challenges, in order to rescue the soul of her dead lover from the goddess Hela.
Hellblade is a game about a literal descent into madness. You take on the role of Senua, a Celtic warrior with a dark past and an even more grim future ahead of her. When she returns home from exile, she finds her husband murdered by vikings, an apparent sacrifice to the gods. Lost and broken, she decides to head straight back to those gods and demand his life back. What follows is a journey to the underworld, in which Senua battles all kinds of horrors in her quest to be reunited with her love. “It isn’t bravery that drives her,” a narrator explains early on. “It’s fear.
If you want to know more about the story and the character I would suggest to play the game by yourself. I would prefer to play in dark and use headphone to have full experience of it. Otherwise there are many Gameplay walkthrough on YouTube.