Episode 11 of "My Happy Marriage" delves into complex family dynamics and supernatural elements, taking viewers on an emotional rollercoaster. At the start of the episode, Yoshiro reveals the backstory of how Sumi became part of the Saimori family. Originally, Sumi was meant to settle a great debt, but her marriage to Shinichi caused a rift between her and Yoshiro, cutting off all communication with her.

In a poignant moment, Yoshiro introduces Miyo to a cherry blossom tree and discloses that she has inherited the mysterious ability of dreamseeing. When Miyo touches the tree, it serves as a portal to the past, showing her the complicated relationship between her parents. Sumi's inner conflict is laid bare as she overhears Shinichi discussing the pressure to confirm Miyo's supernatural abilities. Fearing for her daughter's safety, Sumi seals away Miyo's powers to protect her.

Amid this emotional turmoil, the narrative shifts to Yoshito, Kiyoka, and their team as they battle supernatural entities known as Grotesques. Their mission? To eradicate them all. Miyo awakens from her sleep and is greeted by Arata and a maid from the Usuba family. Arata notices that Miyo seems more at peace, a sign that her nightmares may have subsided. He presents her with a special robe meant for those who possess the dreamseeing ability.

Later, Arata confesses his emotional attachment to Miyo and pleads with her to stay by his side. He reveals that he is bound by an agreement with the Japanese emperor, Mikado, to protect her. Despite the high stakes, Arata eventually relents and allows Miyo to visit the unconscious Kiyoka, who was injured in battle.

The emotional climax arrives as Miyo and Yoshiro revisit the cherry blossom tree. When Miyo touches the tree again, she witnesses the exact moment her mother sealed her abilities and hears her mother's declaration of love, leading to an emotional breakdown. Shortly after, news of Kiyoka's condition arrives, forcing Miyo to make a fateful decision: she must use her dreamseeing ability to awaken him, even if she knows it might not succeed.