He is a better than average student (particularly in math) but has a tendency to oversleep in the mornings and has to be woken up by his sister Miya.A very popular girl in her final year, who has many fans at school.
He also fears heights, as he feels uncomfortable when riding elevators.
Although his sister thinks of him as unreliable and slightly perverted, in the various character arcs he shows that he is quite responsible when he puts his mind to it.
She is a quarter British from her mother, whose family's surname is Lovely (thus Haruka's middle name).
Possibly as a nod to her heritage, she frequently mixes English phrases into her speech.
She can be described as a fickle and insecure girl with a liking for cute things, especially puppies.