Operation Seduce her step-brother with a dreamy notebook where anything she write will happen! Starring Ai Kawana

Ever since she was a child, Ai had looked up to an older childhood friend who lived in her neighborhood and called him "Onii-chan". As she grew older, her feelings for him changed to "love". However! The important thing is that the onii-chan doesn't seem to see Ai as a potential love interest... Not to be outdone, Ai was. Casually asking him out on a date. I'd try to provoke him with a punchline, but... No result. Then. Ai gets a mysterious notebook from an inter-dimensional person who tells her that whatever she writes will be done as she wishes.