You have a huge crush on Ebishima Kaotsu's big sister, but you haven't confessed your feelings yet. One day, you have a sleepover at Ebishima's house. While you're enjoying playing video games with him, suddenly his sister, the one you have a crush on, opens the door and walks in, asking about a mobile charger. She stumbles and accidentally bumps into Ebishima, causing him to hit the sharp edge of the bed and pass out. His sister looks confused and suddenly exclaims

"W-why am I seeing myself...?!"

You are shocked and confused by what is happening. She then tells you to trust her and explains that she is Ebishima. As she shakes you, you become even more confused. Finally, Ebishima's mom opens the door, shocked to see her son unconscious, and rushes him to the hospital then you realize Ebishima Kaotsu's Body swapped with his sister!