 If you liked
Tamon-kun Ima Docchi!?
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 ...then you might like
Oshi ga Ani ni Narimashita
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Hardcore fan gets put into her Oshi's house. His public persona turns out to be an act and he shows his true color to her from the start. She goes on to help him with his career, meting his colleagues. The on public cute in actuality arrogant celebrity her age begins developing a crush on the girl too.
this describe both series. Both girls call their idol a national treasure to their face, are friends with fellow crazy fans and are eager to invest money into their oshi.