Manami is Kyousuke’s classmate and childhood friend. She usually behaves in a pretty traditional mindset, which Kyousuke made fun of her by calling her ‘grandma’. In return, Manami calls him ‘grandpa’. Kyousuke would sometime drop by her house for studying.
It has been revealed in episode 3 that she has a crush on Kyousuke for quite sometime now. She is yet to muster the courage to let him know how she feels through words. Thus, she has been trying her best to get Kyousuke’s attention through her actions. Although as it seems, Kyousuke is quite slow in picking those messages.