If you're looking for anime similar to R-Chuugakusei, you might like these titles.
A commercial for volume 7 of the manga Insomniacs After School, published by Viz Media.
Asai Mugi's everyday life is very much impacted by a singular problem: she suffers from extreme shyness. Her sole friend Touyama Kayo would like to help her out as they've just entered high school, but Mugi's shyness is the sort that steals her voice entirely. It is too bad for Mugi that a freak shout on her part attracted the attention of Nono Ichinose. Nono is on a mission to save her Drama Research Society, and she isn't prepared to accept shyness as excuse from on-stage performances! With a small group of close friends to encourage and educate her, Mugi will be given a chance to be more than she is now. But, can someone so terribly shy really become a stage actress in just a few short months?
It's spring, and love is in the air! Sanada Kouichi wakes up one morning to find a strange girl barging into his house and making herself at home. Only after his friend, Aihara Kazuki, shows up later does he recognize the girl as their childhood friend Mizusawa Mao, who has been living overseas for the past two years. With her parents still overseas, Mao will be living with Kouichi and attending high school with him and Kazuki. The three of them will rely on each other to overcome their challenges with school, friendship, and of course love!
A boy named Ganta and a girl named Isaki are insomniac schoolmates. Both worry about their constant lack of sleep. After a chance meeting in the school's observatory-turned-storage room, the two share secrets, and begin having an unusual connection.
Naoto Watari has had his share of struggles: His parents died two years ago, and now he and his sister live at his aunt’s house. There, his desire to protect his sister earned him notoriety as “the guy with the sister complex,” — which never mattered to him, as his sister always came first. But when Satsuki, a childhood friend-turned-enemy, becomes his school mate, Naoto’s ordinary life is thrown into chaos… and Satsuki may just be the beginning.
When Asumi was just a baby, a space shuttle accident changed her life, and the lives of the townspeople of Yuigahama, forever. As a young woman, the spirited Asumi has only one desire: to someday travel to the stars in a rocket, with her father and ghostly friend Lion-san along for the ride. With heartache, happiness, and plenty of determination, Asumi and dozens of talented teenagers now face the greatest challenge of their lives: the test to enter a prestigious space academy, so that they may one day reach out and touch the stars...
Follows Kimihiko Kimitsuka, a young man who four years ago became the assistant of a mysterious detective known as "Siesta" on a hijacked airplane. Together, Kimihiko and Siesta went on mind-boggling, globe-trotting adventures while combatting a secret organization, but all of that came to an end when they were separated by Siesta's death. In the present day, Kimihiko tries to return to an ordinary, boring life as a high school student, but things are never that simple, even though the detective is already dead.