The Crimson Aurora Rainbow

Yuuga Yuto is an ordinary high school student who is suddenly summoned to another world one day without any explanation, and is immediately elevated to the position of king. Simply because he was asked by a beautiful girl, he carelessly agrees to take on the role of king without thinking deeply, in the manner of light novels and anime. However, this is an age of warring states, and there are countless difficult problems both internally and externally. As someone who is a complete amateur in both military and political affairs, he cannot possibly come up with solutions to resolve them. In the midst of all this, a single decision made by Yuto develops into a major incident that shakes the imperial court, and this becomes the catalyst for him to seriously strive to bring peace to Ameisia, a land overflowing with warfare and conflict. Can Yuto, who is nothing more than an ordinary student, save this confused world of warring states that everyone else has given up on resolving? ※This work has received strong criticism that one of the heroines is violent in nature. If you cannot tolerate violent heroines, a version with the infamous red one toned down has been posted on Kakuyomu, so please read that instead (the content and ending are also slightly different).