A rumored, strange phenomenon that only happens during puberty where one is emotionally unstable.

For example, that's what happened when a wild bunny girl appears in front of Sakuta Azusagawa.

Her true form is actually his high school upperclassman and actress on hiatus, Mai Sakurajima. Mai's alluring form, for some reason, goes unnoticed by those around her.

Sakuta has set out now on a mission to solve this mystery, and while spending time with Mai, he learns her hidden desires… Then, heroines suffering from puberty syndrome start appearing around Sakuta one after another.

In the city where the sky and sea glisten, this mysterious story that will sway your heart starts now.

Sakuta Azusagawa

Voice Actor: Kaito Ishikawa

Sakuta is a second-year high school student and a bit of an oddball who in this day and age, doesn’t carry his cellphone with him. He doesn’t fit in at his school due a rumor that he caused some violent incident, but Sakuta doesn’t mind.

Mai Sakurajima

Voice Actor: Asami Seto

Mai is a third-year student at Minegahara high school. She was a talent who held national recognition, but now she’s taking some time off from acting activities. Due to the fact that she invested so much of her life in showbiz, she is friendless at school. She’s dedicated and has excellent manners, but she also is aggressive.

Kaede Azusagawa

Voice Actor: Yurika Kubo

Kaede is Sakuta’s younger sister. Due to being bullied in her past, she no longer goes outside and instead stays home and is the house sitter. She loves Sakuta and pandas and is working hard daily to become the perfect young sister. Her daily routine is to wake up Sakuta every morning.

Tomoe Koga

Voice Actor: Nao Touyama

Tomoe is a first-year student at Minegahara high school. She’s a modern girl who can read a situation well, but she can be a bit careless sometimes. She conceals her Hakata dialect from others around her, but when she gets flustered, it comes out.

Rio Futaba

Voice Actor: Atsumi Tanezaki

Rio is a cool, calm, and collected classmate of Sakata’s. Rio is the sole member of the science club at school and is known as an eccentric. She is one of Sakata’s very few friends who knows about puberty syndrome and gives him advice.

Nodoka Toyohama

Voice Actor: Maaya Uchida

Nodoka is Mai’s sister from another marriage. She is the stylish member of the idol group ‘Sweet Ballet.’ Unlike her flashy looks, she actually attends a high school for well-to-do girls. She is very aggressive and hates losing at anything.

Shouko Makinohara

Voice Actor: Inori Minase

Shouko is a girl who shares the same name as Sakuta’s first love. Shouko is very shy, but she is serious and a kind girl. When she happens to see an abandoned cat on a rainy day and offer it an umbrella, she meets Sakuta.