Regret「後悔, Kōkai?」 is the sixty-fifth chapter of the Oshi no Ko manga series. It is written by Aka Akasaka and illustrated by Mengo Yokoyari. It was released in Weekly Young Jump on December 9, 2021.[1]
Summary[]
Years ago, Ai took her children to watch That Was the Start at the cinema and she could not stop praising Aqua for his performance. She then called him a genius and said he could become the most amazing actor in the future.
In the present, Aqua continues to deliver a power emotional performance. Kana is impressed but she cannot help but wonder why he looks to be in so much pain. In his mind, Aqua is back in the hallway of his childhood home and is haunted by the vengeful spirit in form of his former life, refusing to let him forget about the past and provoking him to to continue this suffering. He is not allowed a happy life until the culpable party has suffered. Aqua turns around and says that the vengeful spirit is just his past self, helpless and could not do anything but live with the regret. Filled with frustration and sadness, he is going to use these emotions.
Blade (Taiki Himekawa)declares the battle over and to tend to the wounded but things appear to be too late for Princess Saya (Akane Kurokawa). However Tsurgi (Kana Arima) noticed that Saya's sword, specifically the scabbard has the ability to transfer wounds, which she has been using throughout the battle healing not just her allies but her enemies at the same time. Blade and Tsurugi then use the power themselves to bring Princess Saya back alive.
Back in Aqua' mind, Aqua stated it was a fantasy of his that what if the story ended like a story and Ai was saved. He now imagines that coming true and channel that emotion into his performance.

