The bishoujo game industry originated in Japan. It refers to the tough, arrogant and inconsistent behavior of girls in order to cover up their shyness. The original Japanese character is synthesized from the Japanese onomatopoeic overlapping words "ツンツン" and "デレデレ": "ツン" can be understood as sharp, arrogant, cold, and unapproachable, while "デレ" can be understood as coquettish. Of, disturbed by love. The combination of the two can be simply regarded as "cold on the outside and hot on the inside" in love. Generally refers to the transformation from ツン to デレ, but there are also types where ツン and デレ coexist. This Japanese term appeared in the ACGN world around 2000, but it has a profound impact on the development of general relationships between men and women (especially in love games), so it emerged very quickly.
Tsundere (also often translated as cold on the outside and hot on the inside, overbearing and shy, evil, coquettish) refers to "usually speaking with a thorny attitude, being tough and arrogant, but under certain conditions, being shy and clingy around you" Characters, mainly words commonly used in love types. Originally originated from the beautiful girl game industry in Japan, it has become a type of cute object widely in the otaku subculture including animation and comics. On the other hand, it is also used in popular media as a metaphor. Charming characters, love models, topical figures, etc. The definition varies greatly depending on the individual, and it can also be said to be a quite abstract concept.
A kind of cute attribute refers to the trait that changes from "ツンツン (arrogant, willful)" to "デレデレ (shy, sticky)" under different environmental conditions. In Chinese, it is generally called 'Aojiao' (but there are also different translations such as Jiaoman). A newly emerged term is "Ceng De Lei", which is a direct Japanese transliteration, and also shows the characteristics of "tsundere".
Louis in "The Familiar of Zero" narrated by Rie Kugimiya and Sanzenin Nagi in "The Hayate the Combat Butler" created the Kugimiya Pact (Kugimiya Party); later "Ryuu and The addition of Aisaka Taiga in "Tora" made Kugimiya Shimoe, and then Aria and Lotte joined the pledge. Together they are called Kugimiya Liumoe.
The above is for reference, hope to adopt it~