Before diving into Chapter 10, it is important to understand the situation. The protagonist—often a seemingly ordinary or lower-ranked member of the hero’s party—has seen his girlfriend, comrades, and allies seduced or influenced by the heroic "Yuusha." The story focuses on the mental, emotional, and sometimes physical toll this takes, while the protagonist refuses to break.
Breaking down the keywords in this specific search query reveals the core plot of the series: Before diving into Chapter 10, it is important