Attack on Titan manga volume one by Ren could potentially have the origin of the Titans, the first encounters with them, and perhaps the start of the characters' journey to fight against them. But that's just a guess based on the usual pattern of such manga series.
I'm not sure exactly, but it likely introduces key characters and sets the stage for the story.
Well, it might contain the initial setting of the world, maybe introduce the main characters and hint at the main conflicts. But to know for sure, you'd have to read it yourself!
Chapter 261, "Peng and Chen's Shock, the Great Xia Martial Tournament", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. Early on, Second Year of Great Xia, May 9th The last half hour before dawn.. By the end, Speaking of which, Yuwen Dao, the Director of the Hunting Department,....
Chapter 289, "Crushing, Stalling for Time, Ning Yuan Hill's Decisive Victory", is the clearest early answer because it turns Li Xuandu's situation into a concrete plot event. It opens with She had an impression of Xia Hong's strength. and closes on Unlike Chen Yingyuan and Chen Peng, Xia Chuan looked at Xia Hong with.... The key payoff is that the danger stops being abstract and the conflict around Li Xuandu becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 212, "Dispute—Can't Hold It?", is the clearest early answer because it turns Luo Ming's situation into a concrete plot event. The chapter gives readers a real answer by opening on After two years in the Beehive, Luo Ming hadn't attained elite... and ending on Big brother, what about Hong Yu?" Just as Luo Ming was about to....
Chapter 206, "Pleas, Cold Element Festival, the Leader Emerges", is the clearest early answer because it turns Cold Marrow Iron's situation into a concrete plot event. The chapter turns that into something concrete by moving from Xiang Liang stepped into the silent hall, hearing only the echo of... to As Xia Chuan and the others approached to look, all five were....
Chapter 188, "Venting, Drawing Lines, Preparations", is the clearest early answer because it turns Jing Valley's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Chen Yingba hadn't finished speaking when he saw Xia Hong flick his... and follows through with The leader didn't strike fatally and let him go; if those two leaders....
Chapter 288, "On the March, Hou Hu's Wrath", is the clearest early answer because it turns Cloud Dragon Army's situation into a concrete plot event. It opens with Alright, urge the army to speed up, I'll keep an eye on things from... and closes on Visually, the so-called transport team appeared much more impressive.... The key payoff is that the chapter closes with Most of Longyou is flat plains, and there are few places to hide troops and ambush. This snow hill is so conspicuous;
Chapter 274, "Weakness and Strength, the Final Battle Begins (Part 2)", is the clearest early answer because the buildup finally cashes out in a real clash. Early on, The strength gap between us is threefold, Master Luo.. By the end, Next were Xia Chuan and Xu Ning.. Inside the broader battle storyline, the danger stops being abstract and the conflict around power growth becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 238, "Decisive Victory, Admonition, Hou Tong's Plan (Part 4)", is the clearest early answer because it turns Hou Tong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Hou Tong, who had remained at the same rank as Xia Hong, immediately... and follows through with Additionally, with Lord Hong's strength, we should be able to break....
Chapter 216, "Great Medicine, Going Out, Turmoil in Longyou (Part 2)", is the clearest early answer because the rescue effort creates visible on-page results. The chapter gives readers a real answer by opening on Looking at the person directly across from the big pot, still talking... and ending on Due to being located in a plain area with sparse vegetation, the....
Chapter 298, "Hou Jing Surrenders, White Abyss Falls, Zhaoyang Changes Its Flag", is the clearest early answer because it turns Hou Jing's situation into a concrete plot event. Early on, Hou Kong is twenty-six this year, has a Superior Battle Body, and his.... By the end, If I win, I will release Hou Bing as agreed, how about it?" If I....