It looks like you're looking for Chapter 1 of the manga Rainbow: Nisha Rokubou no Shichinin (often shortened to Rainbow).
If you're looking to read Rainbow: Nisha Rokubou no Shichinin Chapter 1, you can find it online through various manga platforms, such as:
Be warned: the series does not let up. Chapter 1 is merely the first step into the darkness. But somewhere, far down that tunnel, there is a light. rainbow nisha rokubou no shichinin chapter 1 full
Opening Scene – “The Night of the Fire”
Analysis
This introductory chapter follows the boys' traumatic arrival, where they face humiliating medical checks and a harsh confrontation with Sakuragi. The story culminates in a scene of defiance as Sakuragi protects them, initiating a powerful, lasting friendship against the cruelties of the institution. List of Rainbow: Nisha Rokubō no Shichinin chapters
"Rainbow Nisha Rokubou no Shichinin" (also known as "The Seven Deadly Sins: Rainbow Nisha's Block") is a spin-off manga series of the popular "The Seven Deadly Sins" franchise. The story takes place in a high school setting and follows the adventures of a group of students. It looks like you're looking for Chapter 1
| Source | Summary | |--------|----------| | Anime News Network (2009 review) | Praised the gritty realism and strong character introductions; warned about graphic violence but noted emotional depth. | | MangaDex Community | Readers highlighted the “instant connection” with the Seven and appreciated the historical backdrop. | | Academic Paper – Post‑War Narrative in Seinen Manga (2021) | Cited Chapter 1 as an exemplar of how post‑war trauma is visualized through institutional oppression. | | Sales Data | First tankōbon volume sold >150,000 copies in Japan within its first month, indicating strong market interest. |