In Western art, the sunflower is Van Gogh’s obsession—a symbol of gratitude and madness. In Japan, the sunflower gained wartime connotations. During the post-WWII reconstruction, fields of sunflowers were planted in devastated cities because they absorb toxins from the soil (a process called phytoremediation). Sunflowers are survivors. They clean the earth.

Several seinen and josei manga have used the sunflower as a metaphor for a character who is expected to be cheerful and resilient (the “sunflower” personality) but only truly feels alive when no one is watching. The “night” becomes a sanctuary. In these stories, blooming at night is not a tragedy; it is an act of self-preservation.

Himawari wa Yoru ni Saku (2021) is a notable 3D animated adult video (hentai) known for its high-quality animation, polished art style, and focus on NTR (Netorare) themes, directed by Ken Raika and produced under the pseudonym Bunnywalker.

To ground the concept, let’s look at how this theme has been executed in media: