Sub Stories can be acquired in numerous ways. Some will automatically trigger over the course of the story. Others will automatically trigger when you walk at specific locations at certain times.
At long last, we are at the closing of the Sakiko story! All that stands between you and the finale is one more comparatively shorter story and three more questions!
Unlocked at Chapter 4. Located in Onomichi. Watch the conversation at Ryunan Shrine, and then talk to the girl. Tell Misa to “Go tell him how you feel.” Return to the shrine. Beat up the thugs. Misa ...