It's definitely gained a significant fan base. The interesting characters and engaging plot have contributed to its popularity. Also, the way it combines romance and mystery elements appeals to a wide audience.
Well, 'romantic killer light novel' might center around a protagonist who is thrown into unexpected romantic situations and has to deal with some sort of 'killer' aspect. This could be in the form of a rival who tries to'strike down' the budding romance or an internal struggle within the main character that acts like a 'killer' of their own romantic feelings. For example, the main character could be a person who has always been against the idea of love but then suddenly finds themselves in a world full of romantic possibilities and has to face their own preconceived notions which are like a 'killer' of their potential for love.
Well, the ending of Romantic Killer manga is a mix of closure and some loose ends. The relationships evolve in unexpected ways, and there's a sense of growth and change for the characters.
The ending of Romantic Killer manga is quite unique. It ties up most of the loose ends but leaves a little room for interpretation. The relationships between the characters evolve in unexpected ways.