Day One

• Remember red tsubaki
• Help kitchen
• Other family?
• Worry about Yasumi

Day Two

• Worry about those two
• Have Yasumi help out
• Help Yasumi shop
• Answer it
• Might not be a bad idea
• Agree
• Commonplace Liver Burger
• Frilly flower-pattern bikini
• Don't leave Yasumi

Day Three

• Talk to monk
• Express regret
• Wait and see
• Have a match
• Keep watch
• Follow
• Ask for her help
• Can only watch

It seems you shouldn't just watch, but try to save her.
Also, if you don't have a match with Migiwa on the 3rd day to see her technique beforehand, you'll be forced to have this ending.