Himawari Wa | Yoru Ni Saku Ova Sunflower Ha Yoru [upd]

According to scattered references on Japanese fan forums from the early 2000s, Himawari wa Yoru ni Saku was allegedly an experimental OVA (Original Video Animation) produced by a minor studio in the mid-1990s. The story reportedly centers on a girl living in a rural town where sunflowers inexplicably turn toward the moon at night. The protagonist discovers that the flowers are not plants at all, but vessels for the spirits of people who “bloom” only in darkness — those who found peace not in daylight, but under the stars.

On the fourth night, a city drone—programmed to extinguish any "unregistered light source"—detects the glow. Hikari and Yoru try to protect the flower. Yoru throws his sketchbook to distract the drone's sensors, while Hikari covers the sunflower with her own coat. The drone sprays a dark foam. The sunflower's glow dims, and it begins to wilt. himawari wa yoru ni saku ova sunflower ha yoru

Himawari Wa Yoru Ni Saku: A flower blooms in a time of crisis According to scattered references on Japanese fan forums