If we assume the title is real but lost in translation, the most logical structure is:
「向日葵は夜に咲く」 (Himawari wa Yoru ni Saku / “The Sunflower Blooms at Night”) — an OVA.
Sunflowers typically turn toward the sun (heliotropism), so a “night-blooming sunflower” is a metaphor for something that thrives in darkness or defies its nature. In anime, this could be: himawari wa yoru ni saku ova sunflower ha yoru top
Search results return zero on official databases. Therefore, this is either:
For the OVA adaptation of Himawari wa Yoru ni Saku, the background music (BGM) was composed by ZIZ. The soundtrack is often referred to as the "Original Soundtrack" or "Image Album." If we assume the title is real but
If you are looking for the "Top" or main theme, it is usually identified as:
Common Track naming convention for this OVA: Since official tracklists for this specific niche genre are sometimes unconfirmed or fan-titled, they are often categorized simply: Search results return zero on official databases
The word “top” has led to multiple theories: