(Explaination of AU)
Similar to the original, Mari and Sunny fought after Sunny dropped his violin down the stairs. He fell because she unintentionally pushed him too hard, causing him to lose his balance. She called Hero over in a moment of desperation to get advice on what to do; he decides to tell everyone he drowned because everyone knew he couldn't swim.
Mari and Hero stopped communicating after this incident, and they both isolated themselves. Hero never attended college and grew resentful as a result, leading to an argument with Kel that was never settled. Following the breakup of their friendship group, Aubrey relied on Mari, while Basil cut off communication out of frustration.