Bunbetsu to TakanDelusional Diary; Funbetsu to Takan; Sense & Sensiblity; Sense and Sensibility; The Little Mermaid who Became a Witch; 分別と多感; 理性與感性-多重熾愛; 분별과 다감

From Jshoujo: Aya has a great boyfriend Kento who treasures her a lot. But she is also attracted to Kento's older brother, who has a twisted personality. How come she can't stay away from him and she goes so far to cheat on her boyfriend? Will Aya's sense prevails over her sensibility? Includes two side stories.