I love it! I love the art, the illustrations, the music!
If there is something I can criticize, is probably Manaka's obsession with Haruaki. I never got to know Manaka as a person, just a yandere imouto.A good example of a yandere imouto is Mihomi from MenheRafflesia. The player is given enough cute sides of her and her tragic past that makes the player care for her. Mihomi also has good reason for obsessing over the MC.
But the presentation is unbelievable and amazing!