I became the best friend character of a cheat reincarnation protagonist, so I'm doing my best to prevent the protagonist's death ~I won't allow you alone to have a harem~

The protagonist dies due to a certain trigger. Then, he realizes he is possessing someone, and that this is the world of a certain light novel the protagonist was reading. The protagonist becomes a "I absolutely won't allow only you to have a harem" kind of guy and snaps off the death flags of the light novel's protagonist one after another. This story now begins. It is also posted on Kakuyomu and Hamerun. There is an illustration of Kirika's image on Hamerun. If you're worried the amateur drawing might ruin your image, you don't need to look at it.