Wtf happened here?
MC's grandma and the elderly woman at the end were in love but could not be together due to certain circumstances. They kept in touch over the years through letters. Years later, MC's grandma sent a robot who looked like her younger self to her friend. MC ended up breaking it on the way so she pretended to be the robot for her Grandma's friend until the robot gets fixed.
Stuff happens and MC makes out with a granny. The end.