If you're looking for anime similar to Shitei Bouryoku Shoujo Shiomi-chan, you might like these titles.
Bouya Harumichi is a new transfer student to Suzuran all-boys high school, a place where only the worst delinquents assemble. Due to its large amount of delinquents who are hated by the general people for their inauspiciousness, similarly to crows, it is also known as "Crows High School". Harumichi is an insanely strong fighter but has an irresponsible personality. How will he act in this new environment where everyone is a delinquent?
Experience the life of a young member of the Japanese mafia. Our main character, Maji, lives his daily life as part of the Nagisa-gumi, protecting the locals and running their turf. He may not be the smartest man in the world, but he has the guts and attitude to become a great Japanese mafia member.
Megumi was a normal kid. He enjoyed getting into fights and mixing it up, and one day he did so in defense of a wizard who was being attacked by bullies. His reward was a magical book that was supposed to grant his wish. The mischievous demon inside the book decided to play a prank on Megumi, though, and instead of turning him into "a man among men," he became a girl. Fast forward to five years later, and Megumi is now entering high school, a tumultuous time for even normal teenagers, let alone a girl who is trying to figure out how become a guy again...
Is it is possible to lead the yakuza and be a high school teacher at the same time? Kuniko has always dreamed of being a teacher, but as the heir of the Oedo Group it isn't easy to do. Her task is made even more difficult because her school would fire her if they found out about her criminal activities.She has to pretend to be an ordinary teacher while fighting off rival yakuza, winning the respect of delinquent students and keeping her family business away from the school. This becomes even harder when her smartest and most curious student begins to find her very... "interesting".
What is Seiichirou Kitano, a boy with the heart of an angel and the face of a devil, supposed to do when he starts his new life as a first year high school student? Accidently defeat the school "guardian" and become the most famous and feared gang leader in the town, of course! With his "henchmen" Kuroda and Takehisa in tow, Kitano turns a simple act of good will into an all-out war with Hakuun High!
To pay for an epic blunder, three yakuza brothers are forced to alter their bodies, form a girl group and break into the underground J-Pop idol scene.