Recorder to Randoseru Do♪

This is an anime where a little boy Atsushi looks like a grown man. And his 17yr old sister Atsusmi looks like a grade-schooler. So pretty much your typical anime stuff.

And of course you have the lolicon jokes. Atsushi is mistaken for a predator because he hangs out with kids.
Older girls are crushing on him. All the little girls in his class are also crushing on him.
All his classmates just treat him like a normal kid.

Its very similar to Cyclops Shoujo Saipuu an anime about a middle school girl who looks 17.
Both anime also have really short episodes 2 to 3 minutes. ...

The hijinks are pretty funny.

It revolves around Atsushi Miyagawa and his sister Atsumi Miyagawa. Atsushi resembles an adult at 5.9 feet tall, but is actually an elementary school boy. Atsumi looks like a 4.5 foot tall little girl, but she is actually in high school. That more or less is the synopsis, from that the chapters that only last 3 minutes are based. The anime isn't bad but I can't finish enjoying it because the anime only lasts 2 minutes so just like you started it it's over but well it has 3 seasons so I'll keep watching it. The animation is good, the soundtrack is also good and ... the character design is also curious, it is also because of the plot that it is SO BIZARRE but well that is also good.
En español:
Gira en torno a Atsushi Miyagawa y su hermana Atsumi Miyagawa. Atsushi se parece a un adulto a 180 centímetros de altura, pero en realidad es un niño de escuela primaria. Atsumi se ve como una niña pequeña de 137 centímetros de altura, pero en realidad está en la escuela secundaria. Esa mas o menos es la sinopsis, apartir de eso se basan los capitulos que solo duran 3 minutos. El anime no esta mal pero no puedo terminar de disfrutar porque solo dura 2 minutos el anime entonces asi como lo comenzaste ya se termino pero bueno tiene 3 temporadas asi que lo seguire viendo. La animacion esta bien la banda sonora tambien y el diseño de personajes es curioso tambien es por la trama que sea TAN BIZARRO pero bueno eso tambien esta bueno.

Honestly was very disturbing overall. Every single joke is just a pedophile joke in some form or another. The sound and art and animation overall was very mediocre, nothing to write home about. There is no opening song, only an ending song. But the premise is where things fall apart. Almost every episode includes a gag where the young boy who looks older gets mistaken as a child molester and/or arrested. There is also an uncomfortable dynamic with the teacher who is fully aware that he is a young child yet still finds herself attracted to him. All of the misunderstanding plots are deeply disturbing ... seeing as they revolve around the theme of pedophilia. Made me very uncomfortable, was not heartwarming at all. Only lasted the whole way through out of morbid curiosity.