Sakurako-san no Ashimoto ni wa Shitai ga Umatteiru - Season 1

Tatewaki Shoutarou is an average high school student in Asahikawa City, Hokkaido Prefecture. However, hh has an unusual acquaintance by the name of Kujou Sakurako, who loves bones more than life itself. One day, on a bone gathering expedition along the shores of Mashike, they find a human skull...

Shoutarou finds a little girl at a convenience store in the dead of night. Other than her nickname, Ii-chan, no one can figure out her real name and address. Finding a bloody handprint on her backpack, Shoutarou asks Sakurako for help. But their inquiries only lead them to a shocking realization...

While on a bone-hunting expedition in the mountains, Sakurako and Shoutarou again find the skeletal remains of a human being. Later, Shoutarou finds out that the body belonged to Kougami's grandmother, whose death the police have written off as a suicide. In disbelief, Kougami asks Sakurako for help...

Police Officer Utsumi asks Shoutarou for a favor. His friend, Fujioka, is afraid of a certain curse where all the men in his family die at an early age. Utsumi asks for Sakurako's help in persuading Fujioka that there is no such curse, but...

The cause of Fujioka's ill health is found to be mold growing on the painting that had been placed in his study at the suggestion of a certain artist. As everyone sighs in relief, there is a sudden commotion in the yard...

While at a summer festival, Kougami is separated from her friends. She happens to catch sight of a woman standing on the bridge. Clad all in black, there is something off about her... As Kougami suspects imminent suicide, the woman vanishes, leaving an ominous letter and a diamond ring behind. Determined to prevent her death, Kougami asks Isozaki and Utsumi to help her find the woman...

With Sakurako unexpectedly showing up at his school festival, Shoutarou is in high spirits. After they're found by Isozaki in the science classroom, they're asked to help organize some materials left by Isozaki's predecessor. Sakurako's elated over the collection of bones, but Shoutarou learns that she once turned her own pet cat into a specimen...

Human bones were found among the specimens in the science room. However, there was no foul play involved. As Shoutarou investigates the circumstances behind their presence in the science room, he decides he needs to visit the former science teacher's sister, Koyuki...

Before her death, Shotaro's grandmother would often ask him to bring her pudding. One rainy day, they find out why.

The year's final bone gathering expedition is cut short when Isozaki informs Sakurako and Shoutarou that one of his former students, Hitoe, has gone missing. In the past, Hitoe's friend, Futaba, had similarly gone missing on Isozaki's watch as their homeroom teacher...

Minami, Futaba, and Hitoe had a secret hideout. Certain that Hitoe is there, Minami leads them to a house in the woods...

Having been told by Sakurako that he mustn't stay by her side anymore, Shoutarou reminisces about their first case, back when they'd initially met.