Based on the title provided, you are referring to the anime OVA "Himawari wa Yoru ni Saku" (often translated as Sunflowers Bloom at Night or The Sunflower Blooms at Night). The "upd" in your query likely refers to an upload or updated release of the OVA.
listings for any surprise "Part 2" drops, but for now, the 2021 release remains the only official entry. or more details on the original story's ending himawari wa yoru ni saku ova sunflower ha yoru upd
Conclusion
The "Sunflower" Metaphor: In Japanese culture, the sunflower (himawari) typically symbolizes positivity and turning toward the sun. The title subverts this by suggesting a flower that "blooms at night," representing a beauty or devotion that persists through darkness, secrecy, and morally grey circumstances. Based on the title provided, you are referring