What a pitiful answer, I want to explain the Cannian system in just three words...

Cannian is the transliteration of Japanese, ざんねんZAN NEN, which means regret~~

The Cannian system is a person with the Cannian attribute. So what is the attribute of sadness?

Representative characters: all the girls in "I Have Few Friends".

Actually, he looks pretty good, seems to be easy to get along with, and makes people feel great at first glance. But after getting to know her more deeply, I discovered that this girl had many strange personalities or hobbies. For example, the blond and busty Kashiwazaki Sena has the character of an uncle who likes to play H gal games and lolicon control.

In short, there is a big gap between the appearance or the impression given at first glance and the true inner nature, which makes people feel very regretful. And this kind of contrasting cuteness is also the true meaning of the cuteness of the Cannian series.

Characters of the residual type are actually not uncommon. For example, the leader (Haruhi Suzumiya) and my sister (Kirino Kousaka) are typical types of residual type, as well as those in the recent new series The Strange Classmate Next to Me. Natsume Chaozi can also be regarded as a representative of the Cannian series.

On the surface, he is a heartthrob, but in fact his personality is really sad~~