Maken-Ki!

The return of the rainy season causes Inaho to experience flashbacks of when she first met Takeru in a park eight years ago. During Element practice in the gym, Takeru tells Kengo and Uruchi that Kumi does not remember attacking her victims. Minori demonstrates Element manipulation on Kai as an example of her strength. After shopping with Inaho at the grocery store, Takeru takes her to the park. With Takeru clueless about his promise that he made with her during childhood, a despondent Inaho wanders off in the mountains, where she discovers a stray cat and later names him Monji for the cross on his head. Meanwhile, Takeru is encouraged by Haruko and Kodama to search for Inaho, then he is berated by Kengo after learning that Inaho wandered into the mountains. A determined Takeru races to the mountains and saves Monji from rockfall, while Inaho uses her Maken, Kamudo, a gauntlet with great force, in order to save Takeru in response. Unable to remember the promise, which was to marry other each when they grow up, Takeru unwittingly says that he will always protect Inaho, which satisfies her. (Source: Wikipedia)