Azusa Suma

She is Aya's chemistry teacher who is known as being one of the nicest teachers in Aya's school. Apparently, she lives near Aya's house and lives off of half priced bentos that she buys at the local grocery store.

[Spoiler] Despite her gentle exterior, she ends up being Aya's second opponent. She uses a method of kick boxing in where each of her moves correspond with one of the elements. [/Spoiler]