愛してたって、秘密はある。 (2017) watch online

When Okumori Rei was in middle school, in order to protect his mother, Shoko, from DV, he killed his father. His father's death was treated as a missing person case and became a secret between him and his mother. Although, Okumori Rei spent most of his life thinking, 'I don't need friends or a lover', he meets and falls in love with Tachibana Sawa. He then decides to marry her. However, soon after his proposal, someone that knows about his "secret" starts sending him eerie messages...!?

Source: TVmaze (CC BY-SA)