Super Seisyun Brothers

College student Chiko Shinmoto is stylish, self-confident, and secretly an enthusiastic otaku; her younger brother Chika is a cheerful but rather clueless high schooler. Their closest friends are the Saitou siblings: the outwardly composed Mako and her quiet younger brother Mao, both of whom have distinctly eccentric sides.

The sisters are best friends, as are the brothers, bringing the four together for freewheeling conversations about school, work, and youthful worries. Ordinary encounters become comic exchanges shaped by their contrasting personalities and the familiarity of sibling life.