After encountering various girls going through Puberty Syndrome, Sakuta Azusagawa's high school days have come to a close, and he is now a university student.

He enrolls at a university in Kanazawa-hakkei alongside his girlfriend Mai Sakurajima, a nationally famed actress. Off campus, he stumbles upon an out-of-season miniskirt Santa.

"I'm surprised. So, you can see me."

This is a phrase he's heard somewhere before. This miniskirt Santa, who claims to be gifting Puberty Syndrome to people, tells Sakuta...
"My name... is Toko Kirishima."

Precognitive dreams, an anonymous online singer, poltergeists buzzing on social media... A mysterious tale with enigmatic phenomenons surrounding girls with wavering hearts starts again.

Puberty continues...

[Source: official English website]