Juujun Na Omega Wa Yoru Ni Tsume Wo Tate summary:

Umezaki Shion, an Omega, is the new manager of talented actor Alpha Matsuoka Yusei. However, this ostensibly innocent relationship is not as it seems. If fact, Shion has a mission. He needs to get closer to Matsuoka in order to take revenge, as he is the son of the actor who forced Shion's mother to retire from the entertainment industry. As Shion gradually gains the trust of Yusei, how will their relationship end...?