In the Kingdom of Lapanesta, a hero named Yulia "Yusha" Chardiet and her party of friends manage to defeat the Demon Lord. However, their sealing spell goes wrong and the girls inadvertently send the Demon Lord back in time to before Yusha became a hero. Reverted to the size of a small girl, the Demon Lord, now known as Mao, becomes a teacher at Yusha's Adventure School with the aim of expelling her so that she'll never become a hero in the future.

In the near future, mankind creates mermaids through the selective breeding of small fish. This is the story of three tiny mermaids who are in a Tokyo pet shop waiting for someone to buy them.

Reishi Kiyota, a ronin student, has a phobia of love due to a traumatic experience and has never been with a woman in his life.His neighbor, Aika Toyokawa, an office worker, likes Reishi and tries to seduce him with all her might..!A handsome, slightly erotic, and love comedy.

When Eri Arisaki wakes up, she is put in prison for some reason in a different world. The prison has its own rules, and Eri is eventually involved in a big conspiracy... A different world prison survival that unfolds in a prison full of girls of different races, each with their own quirks, begins!