I forgot the name of a manga I was reading and now I really want to find it... I tried searching, but came up empty.
It's about these step-siblings, a boy and a girl, and the girl gets possessed by a ghost who was in love with the boy.
She has to get some affection (?) from the boy or else she'll die. And she has to wear underwear with a meter on it to measure the affection.

Yeah.
Thanks!

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"Did you know you can donate one or all of your vital organs to the Aperture Science self esteem fund for girls? It's true!"

O/,

i bet is Saikin, Imouto no Yousu ga Chotto Okashii n da ga.