Sena Hamada

A 3rd Grade junior in an art university. Lives alone in an apartment. Meets with Haruta right after breaking up with her boyfriend, Ryousuke. Without knowing anything about Ryousuke, she plans of reuniting with the help of Haruta.

First appears briefly in novel vol.9 along with Haruta when Takasu and Taiga are selling chocolates. (and in anime EP23 relatively) Her main story is told in novel Spin-off vol.2 "Let's go to Gunma when it's spring! (春になったら群馬に行こう！)" chapter.