If you're looking for manga similar to Akuno Himitsu Kessha, you might like these titles.
At last a manga about cos-players, for cos-players! Ever since the school president established a casual dress code for the student body, Koromo has been wearing her cos-play outfits at her high school (although she claims they are her casual clothes). Follow the daily life of Koromo and her costume-designing best friend. Watch as she graduates high school, attends college, and ventures into the real world all in one fun filled volume!
A happy-go-lucky girl named Silva wielding a scythe and claiming to be part of an evil organization transfers into a normal high school. She befriends her classmates, skirmishes with the heroes of justice, and helps to recruit new members into her organization. It's a comedy full of good and evil, dubious magical girls, hopeless adults, and pudding.
A story told from the perspective of Naruse Yuu, Kuroki's middle school friend.
When it comes to the face of this student organization, it's a little weird, like a fool, scary, or moody. However, mysterious and futuristic days that seem strangely cute pass by.
Shirosaki Rinko is a high school girl who really loves children. She helps out at the kindergarten that her younger brother attends. Also on the way home from the kindergarten are Tsuga-kun, a fierce-looking delinquent, and Mogami-kun, a bespectacled cool-guy who gives off an air of disgust. You might think they're all unrelated, but that isn't the case...maybe?