After the death of her father, Ren Taki travels to Vienna to fulfill a promise she made to him: attend the Melite Conservatory of Music. While traveling there, she meets the flirtatious musical wunderkind Wolfgang Amadeus Mozart, who is surprised to hear her plan to enroll at Melite. As it so happens, Melite is an all-boys school! After talking with the headmaster, Ren enters the school as a student under the male alias "Rentarou." Sworn to secrecy, Mozart is assigned as her roommate. In this new place, Ren meets eccentric classmates such as Johann Sebastian Bach and Pyotr Ilyich Tchaikovsky; but since they live in the same dormitory, keeping her secret from them is a difficult and never-ending task. With Mozart's help, she hides her gender while making every effort to remain in the prestigious school. Surrounded by peers of unimaginable talent, Ren strives to match their skill and compose resonating musical pieces. [Written by MAL Rewrite]
Saotome secretely loves Moe idols even though she is a gal(Japanese term for popular girls). Otonashi is what you would consider Otaku(nerd) that also has a secret. (Source: Batoto)
A 4-koma manga centered around the daily lives of the girls of Hinatabi Bitter Sweets, a band they formed to bring life to their town.
Toyama Kasumi, a first year high schooler with a shy personality, can no longer sing and express her emotions ever since she was made fun of her singing her favorite song. She is lonely and could not make friends even after entering high school. The only time she could show her emotions is through an exchange diary on her desk with a mysterious person named "Saaya" (サアヤ). Saaya seems to attend classes at a fixed time.
On one of her melancholic days, Kasumi saw star-shaped stickers pointing to a direction which she followed and end up at a pawnshop where she found a star-shaped guitar named "Random Star." Seeing the guitar, Kasumi wants to change herself and "shoot for her dreams".
Ichigaya Arisa, the girl she met at the pawnshop, offered Kasumi an alternative. Instead of buying the guitar, Kasumi will get the guitar in exchange of joining Arisa's game called "BanG_Dream!"
(Source: BanG Dream Wikia)
I'm Kanade, who looks up to idols and is working part-time at Talent Agency Fantasista. One day, all the talent and staff (aside from the boss, Hayato, and me) were laid off!
I'm asked to become an idol from the boss for the sake of the company, but... What the heck'll happen to my life?! It's an idol's growth story that started when I was young.
Pianist prodigies Shirou and Kurono are siblings who share a mutual rivalry, as well as a secret. When they play the piano, they can see the tune as an "apparition" in the form of a man. However, when Shirou becomes a high school student, he is no longer able to see it. He hides that fact from his sister and desperately continues practicing in order to catch up to her.
High school student Takeru Sumura has a dark secret: his parents were murdered by demons. Consumed by vengeance, Takeru seeks out the famed demon hunter, Ludwig van Beethoven. Beethoven is a "magia," a wizard who wields the power of music to battle demons. Taken under Beethoven's wing, Takeru joins the ranks of other renowned magia: Bach, Mozart, Shubert, Liszt and Tchaikovsky. This unique team of demon hunters will use their music-based magic to combat the world's demons. Now all Takeru needs to do is figure out how to convince Beethoven to upgrade him from his personal cleaning boy to a full-fledged apprentice!
(Source: Seven Seas)