Rascal Does Not Dream of a Knapsack Kid (light novel)

Finally, the day of Mai's high school graduation hasarrived. While Sakuta eagerly waits for his girlfriend, an elementary schoolerwho looks exactly like her appears before him. Suspicious, and for all the wrongreasons... Meanwhile, Sakuta and Kaede's father suddenly calls, saying thattheir mother wants to see her daughter. She was hospitalized because Kaede'scondition had been too much for her to bear, so what could she possibly wantnow?