August in the Water

Izumi Hazuki transfers to a new high school in Fukuoka and quickly befriends two boys, Mao and Ukiya. The trio's budding friendship becomes the center of her social life, and both boys start courting her in different ways. Mao tries to be supportive while navigating his own growing feelings.

Ukiya consults his fortune-teller friend Miki to gauge his chances with Izumi. Miki bluntly tells him that their signs are not a good match. Mao hears about it but remains wary, watching Izumi's reactions.

During a water-throwing festival, Miki presents Ukiya with a new fortune predicting that Izumi will suffer a potentially fatal accident. Ukiya shows the warning to Mao, who is skeptical at first but notes the date aligns with Izumi's upcoming diving competition.

The city endures drought and a mysterious illness that petrifies internal organs, while two meteorites crash into the nearby mountains. Yo shares petrographs with Izumi and connects them to her husband’s research, suggesting a link to current events.

On the day of the diving competition, Izumi's dive falters as the water seems to harden briefly. Mao dives in to rescue her and she is rushed to the hospital. Doctors inform her sister that she fell into a coma and may not survive.

Izumi regains consciousness but exhibits a heightened awareness of herself and her surroundings. She becomes preoccupied with the mountains and her sense of reality shifts. Her behavior marks a stark departure from who she was before.

Mao and Izumi secretly hike into the mountains and discover a hidden stone circle centered on a large boulder. Petrographs carved into the stone echo Yo's husband's drawings, suggesting a deep link between the symbols and Izumi's experiences. The moment hints at a larger mythic framework behind the events.

Mao receives a call from Yo that Izumi has vanished. Police search for a man believed to have stolen the second meteorite and killed a scientist. Izumi's disappearance deepens the mystery of the town's strange phenomena.

Izumi and the man are found together on the central boulder, along with both meteorites. Izumi claims they belong to a tribe of stone beings aiming to petrify Earth, and she vows to stop them. A doctor cautions that her statements might reflect sudden schizophrenia triggered by the diving accident.

News spreads as magazines claim Izumi can communicate with dolphins and plants. Miki presents a historical record describing a drought and a 'stone disease' tied to meteorite appearances, noting that an ancient ceremony on a full moon ended the crisis.

Yo collapses from petrification illness, exposing the family’s vulnerability. Izumi insists she must act and, under the light of a full moon, travels to a river with Mao to perform a final psychic act and say her goodbyes. She disappears into the river as rain clouds gather.

The next morning Mao is found unconscious atop the central boulder with amnesia about the previous night. Rain begins to fall and the drought ends as the petrifying illness subsides for many. Scholars begin to arrive to study the Hazuki Circle.

Mao becomes a researcher, studying special remains around the world and using Izumi's diary as a foundation. An elderly Mao returns to the Hazuki Circle, lies on the central boulder as rain falls, and Izumi reappears, unchanged by time. They embrace and then vanish together.