ヒロイン達のことを娘のようなものだと思っている不老不死系主人公VSそんな主人公のことをわからせたいヒロイン達 (Associated Names)

Rex is immortal. Due to his exceedingly high mental age, he can only think of the heroines as something like daughters, and his inherent insensitivity means that he doesn’t even notice their approaches. While others worry that he might be stabbed someday, somehow things will work out. …But it still might be hopeless. This is…