Tatenokawa Tsumuri

Magia: Ice Engraver, an ability that allows the user to turn water into ice and manipulate the shape of the ice as it forms.

Tsumuri is a young genius and a magia researcher... and her first love after research is her kotatsu, followed by Leeruxu and sweets.

Spoiler

Tsumuri mother is called Minori. She does research because she wants to learn about her mother dies