Bravo, very good writing. I started reading this when I saw all the comments so I came in with no expectations and could read it in one sitting. This is one of those stories where on the surface level it seems to be fluffy but looking more closely shows Hikari in not such a good light. She spies on him fapping (like can a man fap in privacy, shit), stalks his conversations, acts surly and not nice to him because she can't read her mind, can't stop talking about him to her friends who are also not very nice and honestly annoyed, and displays the makings of a yandere. One friend even says she likes her quality of being detached from reality.
The male mc Ta-kun on the other hand seems nice. He rejects his kouhai but is very honest and nice about it, even offering to walk her to the train. He is always considerate and honest with Hikari, and just seems to be a stand-up dude. Unfortunately, he's going to probably meet his demise. All the hints for the latest chapter were sprinkled throughout the story. A lot of not so good women, one of which hits on Hikari's crush, and a very stand-up dude who is obviously very popular with the ladies. This could get ugly and it is all there behind a facade of fluff. Really good stuff.