Tsundere

Tsundere (ツンデレ) is a Japanese term for a character development process that depicts a character with a personality who is initially polarized warm/soft, cold, temperamental, hotheaded (and sometimes even hostile) before gradually showing a warmer, friendlier side over time. The word is derived from the terms tsun tsun (ツンツン) ('to turn away in disgust or anger') and dere dere (デレデレ) ('to become affectionate').

The main basis of the series is built on tsundere type relationships:
 * Akkun and Nontan's relationship, where Akkun often shows his tsun side to Nontan - and hides his dere side. A similar bond is observed between Nontan's parents.
 * Masago and Chiho's relationship, where Chiho shows her tsun side to Masago, but is building up a dere side. This is the most common form of tsundere relationships in anime.
 * Konagi and Kubomura's relationship, where Konagi believed Kubomura to be a tsundere who hides his dere side.