She's channeling some yandere energy there at the end. Even kissing the book in the extra page. Dude is gonna take the hot/crazy plunge it seems so hope he has something better than a School Days nice boat ending.
This needs to end where all three of the main girls have a friend that gets interested in Kotaro and he ends up with all three of those friends instead. Absolute defeat for the childhood friends.
Reminds me of how I felt after I managed to get all the (up to that point) available characters in Princess Connect with the exception of summer characters and new years and with summer coming up.... Clownchyroll shits on the game and shuts off the service. Moral of the story is be mindful of...