End of the World is Deep Love

Fuyuka is a girl attending art college in Tokyo, against her parents' wishes. Her younger step-brother had always supported her, despite their strict upbringing, and she feels guilty about going away and leaving him alone at home. One day, she is at her wit's end because she can't afford to pay rent, when her brother, Ameon, suddenly shows up...! Now the siblings are living together, and her brother's love is too heavy for her to bear! (Source: Kodansha, translated)