Having gotten this far after Tiara's reincarnation and MC's maid, I can't say the author knows how to use the characters he has. He introduces her with a lot of talk about love, highlights her several times, but barely develops the character. He even tries to explain that "I'm older than him, I don't have that thing for love." In this chapter, he creates a romantic atmosphere with an elf MUCH older than everyone in the castle or even in the town, and lets the story take a complicated and poorly developed direction.
The protagonist is practically thwarted by everything the author does: his thoughts, his actions, his resolutions. This is already making the story tiresome, aimless, and forced in some parts. Nothing is really building, and everything is wasted: romance, action, drama, overcoming, to the point where everything is easily resolved with a few words, like Naruto, and ends up taking away all the depth of this world.