From incredible highs to even worse lows, the season had everything.
Here we look back at the campaign through the medium of an A to Z.
A is for Arrivals - Boss Steve Evans made his plan of action perfectly clear in the summer with a raft of new signings and that recruitment process carried on throughout the entire season. By the time the loan window closed at the end of March, the Millers had signed 31 players.
B is for Beachwear - Never one to shun the limelight, Evans grabbed the headlines after the Millers had achieved Championship survival by telling everyone he would turn up to the final game of the season in a sombrero and beachwear. True to his word, the Scot exited the team bus at Elland Road dressed in the Mexican headwear, shorts, T-shirt and flip-flops. It was a sight no one will forget easily.
C is for Captain Morgan - The Millers skipper had a fantastic campaign playing back in the Championship for the first time in several years and led from the front with a series of strong and committed performances. But despite that form, Morgan has been made to wait for a new contract offer as the Millers wanted to see what division they were in next season. Although he has indicated he would like to stay in South Yorkshire he has already received contact from other clubs. Keeping him could be the best piece of business Evans does.
D is for Dropped points - Given the standard of the Championship - rated among the best in Europe - every point has to be earned, but the Millers undoubtedly threw a hatful away which could have made their season more comfortable, none more so than in games against Blackpool, Fulham and Sheffield Wednesday.
E is for Errors - As successful as this season must be classed, it could have been far easier had the Millers not shot themselves in the foot so many times with defensive mistakes. The obvious ones included Adam Collin's kick at air against Blackpool, Kari Arnason's slip against Watford and Lee Frecklington failing to match Kieren Lee's run against Sheffield Wednesday.
F is for Farrend Rawson - Arriving at Rotherham two hours before his debut as someone no one had heard of, Rawson left Rotherham a month later as one of the most talked about players of the season. It was Rawson who was the "ineligible" player which threatened to derail the Millers' campaign, though the fact he was not registered was by no means his fault. His four impressive performances during his loan spell have almost been forgotten.
G is for Goodbyes - With the rate that Evans was bringing players in, it was inevitable that some were going to leave and the promotion-winning squad of last year was soon broken up. At different stages throughout the season the Millers said goodbye to heroes Kieran Agard, Alex Revell and Joe Skarz and on each occasion it was a sad day.
H is for Hitting the back of the net - When Matt Derbyshire missed some of the easiest chances a striker could ask for before Christmas it looked as if he was another one of the signings that hadn't worked out. But after grabbing his first league goal of the campaign at the end of January, Derbyshire went on to score a further eight more in 19 appearances and provide the answer to the Millers' goalscoring problems.
I is for Inconsistency - Another pointer to just how tough the Championship can be is the fact that the Millers went through the entire season without winning back-to-back games. Blackpool were the only other team not to manage it and explains why Evans' men were never able to pull fully clear of the relegation zone.
J is for John Fearns - It's sometimes easy to forget that football is just a game, but it was rammed down everybody's throats before the Sheffield Wednesday clash when Millers fan John Fearns tragically died on the concourse at New York. The disappointment of that afternoon paled into significance when news emerged of his death, which was sadly followed a few days later by news of Pete Johnson's passing, another Miller who also fell ill prior to the Owls game. Gone but not forgotten.
K is for Kari Arnason - The Iceland international played more minutes than any other player this season, missing only three games and he was a key performer. Initially starting well at centre-back, his levels dipped in the back four so Evans moved him into midfield and Arnason showed his class with a string of impressive displays and two vital goals.
L is for Late goals - The hallmark of Rotherham's promotion last season, but it was at the other end where the late goals were flying in this time around. The Millers conceded 15 goals between the 81st minute and the full-time whistle and that equated to 14 lost points over the course of the campaign. They did score nine of their own goals in that time period but game management is something they will need to improve on for next season.
M is for Millwall - A real rivalry developed between the Millers and Millwall as they fought to avoid the drop. It heated up with the despicable crowd trouble after the Millers' 2-1 home win in February, where Lions fans tried to invade the home areas, and it ended with a war of words as Evans taunted Lee Gregory by wishing him the best of luck in League One next season.
N is for Never-say-die - Although they lost a fair number of points due to late goals, Evans' side showed their usual levels of spirit and desire to claw plenty of points back themselves. They battled back from deficits to take points in games on eight occasions, with only three teams scoring more than their 13 equalising goals throughout the campaign.
O is for October - It was the balmy days of Autumn when the Millers were arguably playing their best football of the season and their four games in October produced six points - the best monthly points ratio of the term. They earned a point from a trip to Norwich, followed that up with a win over Leeds, should have had another against Fulham but drew and then came from behind to draw at Brighton.
P is for Points deduction - It threatened to define their season for a short while as the worry of a points deduction and its subsequent occurrence following their Football League charge pulled the Millers back into a relegation dogfight. But the Millers went unbeaten in the wake of their charge, meaning the three-point penalty was academic.
Q is for QC Jim Sturman - The hiring of the top lawyer to defend them in their fight against the Football League charge indicated that the Millers thought they had a good chance of winning the case and avoiding a deduction. But despite the heavyweight's presence in their camp, the Millers were stung and then decided not to appeal the decision. Let's hope he was working on a no win no fee basis!
R is for referees - It's never been uncommon for Evans to take umbrage with the referee after his sides have lost and this season was no different, though there was more substance behind the rants. The Millers seemed to get an alarming amount of decisions go against them throughout the year which led Evans to question whether people at the Football League wanted his side in the Championship.
S is for Survival - There were plenty of ups and downs and they definitely did it the hard way but ultimately the Millers achieved their number one goal of staying up in the Championship - a fantastic accomplishment given their quick rise up the leagues and their illustrious surroundings. It may ben even tougher next year but at least they now know how to do it.
T is for Tinkering - After bringing so many players throughout the season it is perhaps no surprise that Evans did not know his best side and as a result he changed his starting XI on pretty much a weekly basis. Over the course of 49 league and cup matches he made 116 changes and kept an unchanged side on just 10 occasions, the first of which did not come until December 13. And with 21 back-four combinations fielded, it's no surprise that the Millers were at the wrong end of the table.
U is for Unrivalled - There was very often little competition for Richie Smallwood when judging the best Millers player on the pitch. The dogged midfielder was rightly awarded the club's player of the year and it came due to consistent displays of tackling, breaking play up, starting attacks and harrying opponents. His signing has to be one of Evans' best ever.
V is for Victories - There were 11 of them to celebrate and each one seemed vital at the time. The win over Wolves was important to get the ball rolling, while wins over Blackburn and Leeds proved the Millers cut could it at this level. The key games were the Millwall victory in February and the success over Reading, which led to scenes of joy.
W is for Wastefulness - It could have been a far more comfortable season had the Millers not been so wasteful in front of goal. There were many occasions throughout the season where they missed chance after chance to put the ball in the back of the net and were usually made to pay for it. On average they had 13.7 shots per game in the Championship and scored one goal - that tells you everything you need to know.
X is for X-rated defending - On occasions this season watching Rotherham has been like watching a 'how not to defend' masterclass. Although they came up against top-class opponents, the number of times they did not do the basics like picking up a man at a corner or not letting the ball bounce in the area was another reason they were not in mid-table.
Y is for Yorkshire - Evans always gets his men fired up for big derby games and this season was no different as the Millers took nine points from their clashes with Sheffield Wednesday, Leeds and Huddersfield. They beat Leeds at home and drew with them away, did the opposite with the Terriers and if we pretend the home game with Wednesday finished after 90 minutes then that record would read even better!
Z is for Zeki Fryers - The epitome of why the loan system is flawed, Fryers contributed little to the Millers' cause in his two-month stay, other than adding to their defensive frailties. No better than Skarz or Reece James, who had played left-back prior to him, his arrival was one that left everybody scratching their head.
