Class has ended for the day at Mikan's school. Mikan's teacher, Haruko Nitta notices that Mikan doesn't look too good and asks her if she's okay. Mikan says there's no problem and thinks to herself that she still has to prepare dinner tonight.
Rito and Lala come home but are surprised to find Mikan unconscious in the living room. They carry her back to her room and take her temperature. Rito comments that she's been working too hard around the house, and he and Lala offer to take care of the household duties while she gets some rest. Rito is busy cleaning the bathroom when he hears the washing machine explode (it was Lala's doing, of course ). Mikan wakes from the noise and starts to worry.
Rito comes back from the store and notices Celine the plant reading a book on family medicine (even the plant's worried about Mikan, awww ). Rito enters the kitchen and finds Lala cooking...in nothing but an apron She tells Rito that she got the idea from Lisa and Mio, and Rito starts freaking out Mikan is disturbed by all the commotion and offers to finish the cooking herself.
Rito says that Mikan is such an excellent cook, and that he always appreciates her cooking since he can't cook well himself. He says that Mikan i so good at everything that he wonders if he's really necessary to her.
Mikan starts blushing excessively and says, "Rito, you always say good things, so I guess it's fine...."
Then Mikan drops the bombshell: "Rito, you know that we're not blood siblings, right...?"
Rito is dumbfounded, and Mikan starts busting out in laughter over his reaction She teases him further by saying she's not in primary school anymore Afterwards, Mikan says that she's grateful to have Rito as her brother and thanks him for everything.
Lala witnesses this and thinks back to her own sisters...