Double black is a literary giant wild dog, which pair of cp?

There are two pairs of double blacks: one is new double blacks, and the other is old double blacks. Old "Double Blackness" is Osamu Dazai's Disqualification on Earth and なかはら まこと's Dirty Sorrow, which were named "Double Blackness" because they once destroyed the enemy and the headquarters together. The new double black refers to Nakajima Atsushi, the beast under the moon, Akutagawa Ryunosuke, and the new double black cultivated by Osamu Dazai in the background, which was upgraded with the combination leader in World War I..

The above is the origin of double black.

PS: There are four kinds of cp here, namely, Taizhong, Zhongtai, Mustard Dun and Mustard Dun. There are also two kinds of cp: Taimustard and Taidun.