Hello Morning Star summary:

Atsuto is the center of 5-man idol unit L. PLANET. Yuki is the charismatic and popular singer of band idol group REAL from the same company. It is rumored that the two of them are rivals for the next top idol nominations, but back when they were contending for positions... they were lovers. Atsuto was the first to secure his debut, and shortly after the two of them began to grow apart. They broke up, and things remain awkward. But it seems as though Atsuto still has feelings for Yuki after all this time...