The Nanatsu no Taizai Kamigami no Gekirin manga is the original source. The anime takes inspiration from it and attempts to recreate the world and events. There could be added elements or tweaks, but the main plot and character developments are usually consistent.
The manga serves as the basis for the anime. The anime tries to stay true to the story and characters of the manga, but there might be some minor changes.
Overall, the anime adaptation of Nanatsu no Taizai Kamigami no Gekirin follows the manga closely. Some scenes might be adapted differently for better visual presentation or to fit the pacing of the anime, but the core elements remain the same.
Chapter 202, ", Airdrop Assault", is the clearest early answer because it turns Escort Ship's situation into a concrete plot event. A useful checkpoint is the way the scene starts with When a light curtain appeared around the sea platform, blocking all... and follows through with And they didn't have much time to spend several months on....
Chapter 170, ", Mother (Extra 7,000 words)", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with Military garrisons are only right and proper! and closes on But this would incur a substantial political cost, which Pei Desi was.... The key payoff is that the chapter closes with The obvious reason for not giving all of it to Gu Hang now was that they didn't want to.
Chapter 123, ", throwing chaos couldn't even do this", is the clearest early answer because it turns Black Boxes's situation into a concrete plot event. The chapter turns that into something concrete by moving from When Gu Hang placed several new "Black Boxes" in front of Wu Jiarong,... to this is much harder than producing artillery..
Chapter 95, ", The Governor Can't Come for Nothing, Right?", is the clearest early answer because it turns Osenia's situation into a concrete plot event. The chapter turns that into something concrete by moving from The reason for having Osenia handle the city-wide screening wasn't to... to Of course, distributing only food would not suffice..
Chapter 188, ", Whistling In", is the clearest early answer because it turns Jason Morgan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jason Morgan was now somewhat panicked. to It was time to consider evacuation, moving people out..
Chapter 211, ", ten consecutive draws at the 1000 level!", is the clearest early answer because Alliance finally turns buildup into a real advancement. The setup is Gu Hang was responsible for the tax revenue of fifty million people..., but the pressure keeps building through If not for the cheating capability in military training provided by....
Chapter 197, "From today onwards, I am Phoenix_2.", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on Anyway, the genetic seeds aren't precious to Gu Hang, they're just a... and ending on All he saw was the encouraging look in Priest Rizzo's eyes.. In story terms, the danger stops being abstract and the conflict around power growth becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 199, ", New Blood of the Battle Group", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on After receiving the 1432 points of grace this month, Gu Hang now had... and ending on Out of the 150 carefully selected teenagers, only three could be....
Chapter 98, ", Tactical Interweaving", is the clearest early answer because it turns Kodi's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the midst of the battle, getting flanked was disastrous. and ending on In this situation, their line was somewhat precarious.. In story terms, the chapter closes with It's a bit tough, no drafts saved, wanted to post more but didn't finish writing...
Chapter 203, "The Great Impurity", is the clearest early answer because it turns Atonement Expedition's situation into a concrete plot event. The chapter gives readers a real answer by opening on All who had seen the sight within the living cans could not endure... and ending on Their superhuman mental willpower wasn't something that could be....