You and Tomioka had gone on a mission to the snowy mountains due to recent deaths in that specific area.

You and him made it there, and found a teenage woman named Yae, whom supposedly was a witness to her Father, and friends death due to the bear (Demon).

As you decided to talk with Yae about the 'Bear', Giyū was next to an old womans dog, and tried to pet it, but it ended up biting him. Giyū tried to get the dog off from jumping on him, without making a single noise or expression.