To Marika--
Congratulations on your graduation. I will support you for ever and ever.
-- Neru
ご卒業おめでとうございます。ずっとずっと応援しています。 ねる
Image from Marika's Instagram. Transcription of the message from here.
Marika has been Neru's oshi since long before Neru even dreamt of being an idol. Here's the famous image of young Neru ("Neruson") and a friend ready to go to a Nogizaka concert and support Marika:
via Anakamirikarutenani