This is a page listing a comprehensive chronological timeline of the major events in the Prison School manga by Akira Hiramoto. The main setting of the series is Hachimitsu Academy and as such, most events take place in the school and the surrounding urban area in Tokyo. The dates are sourced from bonus calendar material and extrapolation from the time of the plot setting.
June 22nd: The ASC plan to enlist Hana; Shingo's failed karaoke date with Anzu; Gakuto learns about the ASC's plans to rescind the Wet T-Shirt Contest.
June 23rd: The crowling tree fire incident to frame Meiko occurred and is extinguished by others.
Shingo's angry confrontation with Kiyoshi; Gakuto discovers Mitsuko's yaoi interest in a bookstore date; Kate announces her plan to abolish the USC.
June 24th: The middle-school reversion of Meiko's Vice-President persona; the failure of Andrenomics; Kiyoshi's lone investigation of the fire; the extension of the USC's sentences; Mitsuko's misunderstanding of Joe & Gakuto's relationship.
June 25th: The imprisonment of Kiyoshi with Hana's release; the initiation of Risa's BDSM interest.
June 26th: The failure of Risa's BDSM engagement with Andre; the complication of Gakuto's relationship; the Kiyoshi-Mari ouroboros incident in the bathing area of the prison compound.
June 27th: The enlistment of the boys to the USC's plans; Joe's support for Mitsuko's yaoi.
June 28th: The jailbreak declaration by Mari; the charade kiss between Mari & Kiyoshi.
July 2nd: The Sports Festival & the Great All-Student-Council Cavalry Contest;
ended as a draw.
The time-consuming detour of the Chairman for a Honey, beautiful female hitch-hiker.
The Chairman crashed his Lamborghini, gets lost in a forest and is concussed by a waterfall dive.
The amnesiac Chairman escapes a hospital and enters the forest to meet Honey again.
Honey is kidnapped by strange men & rescued by the Chairman; they assume a forest hideout.
Honey is spurned by the Chairman after the elopement of the pair. The hunt of bear begins
The urine incident between Kiyoshi and Hana in the boys dorm with Gakuto and Chiyo in the room.
The jockey contest between Anzu, Satou and the PBR fragment; the PBR is voted the victor.
The women's obstacle contest and men's short-distance race.
The compulsive underwear exchange between Hana and Kiyoshi before the contest.
The Cavalry Contest begins with three USC teams against the ASC's whole cohort & Andre.
The dual social suicide and near-death of Kiyoshi, revealing his nudity & panties to the others to win.
The appearance of a special gyaru-cavalry team led by Bitch, defeated by Kiyoshi.
The secrets of Satou, Anzu and Mayumi being revealed by Kate, shocking the boys.
Thanks to Chairman and Mr. Important's effort with the mind of the former cured, the bear is caught.
Meiko's near-death experience, sings a song for Mari, regains her sanity.
Unleashing Mitsuko's secret mass-klutz power by Kate in order to complicate the battle.
Wild run through the girls in order to catch PBR fragment as a result of Gakuto's attempt to save Mitsuko.
Return of Chairman on school grounds in a damaged helicopter, destruction of the PBR fragment, destruction of the Prison Block.
The prophesised loss of the Cavalry Battle by the USC through the Ant Prophecy did not happen.
The Cavalry Battle was declared a draw, both the USC and ASC survived, the prisoners are free.
July 3th: Ongoing investigation of the helicopter crash with the Hachimitsu's courtyard being off-limits; Kiyoshi, Shingo and Joe having hard time with girls; Gakuto and Andre's popularity rise; Kiyoshi's insanity after misreading Chiyo's letter, leading to his suicide attempt; construction of the PBR Mark II begins
July 4th: Kiyoshi's attempts to raise money for Chiyo's birthday; Bitch's game with Gakuto in the box; Meiko's barrel training with Andre
July 5th: Hana and Kiyoshi's date happened with Kiyoshi's mind being cured and Hana's confused; Bitch's interest in the Three Kingdoms; Risa's visit of her BDSM vendor for advice;
July 6th: Risa's intervention between Andre and Meiko; Hana became Chiyo's apprentice in the art of calm mind; contest between Mitsuko and Bitch over Gakuto with both of the girls dumping him; Mari took her belongings from the dorm with the intent of leaving Hachimitsu Academy for good; Risa's gift for Andre is thrown away and found by Andre who is later punished by the BDSM vendor's whip
July 7th: The USC celebratory barbecue and Chiyo's birthday party are scheduled, but the Chairman is imprisoned by police and Mari leaves for the airport; Hot pursuit of Kiyoshi, Meiko and Kate for preventing Mari leaving Japan occured
The summer term final exam of the academy is scheduled within this month.
The completion of the summer term is within this month.
The summer holiday is set to begin after the end of the term.
The summer foreign homestay program is scheduled within this month.
There is a large fireworks party within this month.
August 2011
The summer club competition is scheduled within this month.
The Hachimitsu Academy annual seaside summer camp is scheduled in this month.
The USC scheduled the Wet T-Shirt Contest during it; the ASC scheduled a clamming trip.
There is a water bucket contest scheduled after this event.
September 2011
The autumn term is scheduled to begin at the start of this month.
These events are scheduled during the month in chronological order:
The school autumn festival.
The Miss Hachimitsu contest.
The grand prix contest by the USC; a movie cinema trip by the ASC.
October 2011
The autumn midterm exams are scheduled within this month.
The annual rowing contest is scheduled at the end of the month.
There is an acrobatics competition is scheduled after this event.
December 2011
The autumn term final exam is scheduled at the start of this month.
The completion of the autumn term follows within this month.
The winter holiday is scheduled to begin subsequently within this month.
The student erasmus party is sometime within the holiday.
December 30th: the New Year's Eve school countdown party.
2012
January 2012
The winter term is scheduled to begin at the start of this month.
February 2012
The general admission period to the prison compound is allocated within this month.
February 3rd: The Setsubun festival; the academy bean-throwing ceremony.
The marathon track tournament is scheduled after this event & within this month.
February 14: The non-romantic ice-skating tournament is scheduled for this date.
March 2012
These events are scheduled during the month in chronological order:
The senior graduation ceremony.
The student evening prom.
The academic parent-teacher evening conference.
The completion of the school year with the spring holidays set to begin.
Trivia
Continuity errors
The break-in by Gakuto is listed as two days preceding the Sports Festival on June 28th in chapter 143, though the Sports Festival is scheduled four days later.[1]
The time of the Sports Festival is listed on June 30th in chapter 224, though the Sports Festival is in fact scheduled two days later.[2]