This will just be an image dump for Hasumi Nagatomi, a character from Idolm@ster: Cinderella Girls. Her birthday is March 19, so this is kind of a birthday dump. She is considered a literal who in the franchise so it would be no surprise if you never heard of her.
For anyone wondering, she is an idol who wishes to be like the idols of yesteryears - she's considered a "retro" idol by fans, and enjoys things of nostalgic quality in general. She's often cited to be an idol who can be associated with the broadscoped Showa period of Japan. She wants to bring a more wholesome image that is seemingly rather forgotten in the idol universe these days. Hasumi's idol interests started with her mother who shares the same interests and she can be considered quite the mama's girl.
With that said, some birthday-timed images for now.
Your dedication to her is commendable. I salute you, Anon.