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Tear Jerker: Gakuen Babysitters
When Ryuuichi is sick, he has a nightmare about the day that his parents died, only they also decide to take Kotaro along with them so Ryuuichi won't have to babysit again. Ryuuichi tries to stop them, but an invisible wall separates them and he's powerless to stop them.
When Kotarou is sick in the first chapter, Ryuuichi tries to call their father. That's when he remembers his parents aren't alive anymore and he finally starts to mourn over their deaths.