Danchigai

Centers around the activities of a family unit.

Prominently features a character who acts cold and hostile in order to mask warmer emotions.

Features sexual or romantic relations between characters who are related by blood.

Prominently features two or more siblings that were born at one birth.

Prominently features a character who generally retains a cold, blunt and cynical exterior, but once one gets to know them, they have a very warm and loving interior.