I don't know what's the name of that song. It's a tribute song for all anon who love their 2d waifu but their love couldn't be meterialize because anon's love one is in different dimansion. It was quite famous in nico-nico douga back in the day. The intro sounds something like this link
https://a.eax.moe/YzmttuMy.ogg sample I post here. Anyone know what's the title name of this song?