"The Dreaming Boy is a Realist" OP, but... [read description]
It's reconstructed using the various other anime openings it's referencing.
Based on the comparison video by @HyTaKe2
• Yumemiru Danshi wa Genjitsushugisha Openin...
(sorry, i disagree with you on the Higurashi bit, so I excluded it here)
I was initially worried content ID would pick up on this and almost gave up on doing this, but I had a hunch that, since the video switches sources every few seconds or so, it shouldn't be able to easily know what to look for to get a content match. I was right. :p
Subtitles taken from HIDIVE.
...Extra stuff down below to make this video more searchable...
JP title: 『夢見る男子は現実主義者』
Romaji: "Yumemiru Danshi wa Genjitsushugisha"
Sources used (in no particular order):
Nisekoi S2 ED1
Monogatari S2 OP3 (Otorimonogatari)
Oregairu/My Teen RomCom SNAFU S2 OP1 (TV broadcast ver.)
KanoKari/Rent-A-Girlfriend S2 OP1
Bottom-tier Character Tomozaki OP1
Rascal Does Not Dream Of Bunny Girl Senpai OP1
Shikimori's Not Just A Cutie OP1
Engage Kiss OP1
Charlotte OP1