Hiyori Asahina (朝比奈 日和 Asahina Hiyori) is a friend of Hibiya and Konoha, as well as the younger sister of Ayaka[9]. She was involved in and died in a time loop in the Heat Hazeon August 15th. She becomes the 10th member of the Mekakushi Dan.[10] 

Hiyori is a young girl who admires the big city. She is incredibly active and stubborn, and was the person who dragged Hibiya to the city with her. She is popular among her classmates, but not interested in romantic things, and even Hibiya is only considered a "convenient classmate who listens to what she says."She seems to be a messy and careless girl, as she would leave trash all over her brother-in-law's house. She has a sharp tongue and does not hold back to show a mean and insulting attitude towards Hibiya, often ordering him to do various errands for her. Though, she truly cares for him and considers him her only true friend. Despite her pessimistic behavior she has a weak spot for cute and girly things.[12] When being with people she admires however, such as Momo and Konoha, she tends to show the sweet and excited side of herself, which can turn out a bit too protective.[14]She shows concern for others, choosing to seek out and investigate Kido's corpse, when her power shows her visions of it[15]. This, combined with her happy and carefree nature while talking to Momo, Shintaro, and Konoha, suggests that she is actually a sweet and thoughtful girl when interacting with people she likes.