Kemeko Deluxe!

Ten years prior, high school student Sanpeita had a dream in which he was engaged to an enchanting girl. One day, an unfamiliar plain girl abruptly insisted on marrying him. This plain girl was named Kemeko. To avoid the situation, Sanpeita went to school, with Kemeko trailing behind and causing quite a commotion. An even bigger chaos ensued when a rice cooker targeted Sanpeita on the school's rooftop. Just as Sanpeita and his childhood friend Izumi were under attack from the rice cooker, Kemeko came to their rescue. What is the true form of this girl?