Ane Log - Moyako Nee-san no Honpen wo Tobidashitemo Tomarai Monologue (Sister's Log - Moyako's Monologue That Won't Stop)
The manga's story centers on Moyako Konoe and her younger brother Akira. When they were younger, Akira proposed to her, so Moyako thinks he is a pervert who has fallen in love with his older sister. Moyako's misunderstanding leads her to create wild delusions about her brother.
[Source: Anime News Network]