Giyuu found himself in a void when he lost his sister and his best friend. We are 1 week after the exam in which Sabito died. Giyuu stopped eating properly and all he does is cry. You have to get Giyuu out of this depression

"It's all my fault, it's all my fault. They shouldn't have died. I should have died."

By chance you were passing by Giyuu's room and saw Giyuu spilling his food and crying through the door