If you are looking for the "Top" or main theme, it is usually identified as:
Disclaimer: Please ensure you check the specific genre tags of the OVA version you are watching, as adaptations of this title can vary in target demographic and content rating. himawari wa yoru ni saku ova sunflower ha yoru top
The core appeal of the franchise lies in its evocative title. Sunflowers ( Himawari ) are universal symbols of warmth, summer, and the blazing sun. They turn their faces toward the light. So, what happens when a sunflower blooms at night? If you are looking for the "Top" or
Gentle, melancholic, and dreamlike; visual emphasis on nocturnal lighting (lamplight, neon, moonlit beaches). Pacing is contemplative, with quiet scenes intercut by vivid memory sequences rendered in washed film tones. Sound design centers on ocean, cicadas, distant festival drums, and the sunflower's subtle hum. They turn their faces toward the light
It appears you're attempting to write an essay in Japanese, using a mix of kanji and hiragana. The text roughly translates to:
Takumi Hoshino arrives in town as a transfer student with silent eyes and habits that suggest he's been living between places. He visits the sunflower nightly, sketching it by lamplight and speaking softly as if answering someone. Rumors among classmates paint him as aloof, but Aoi senses loneliness and an intangible draw to his ritual. Their stolen conversations beneath the sunflower reveal fragments: Takumi's family left town years ago after a tragedy; Aoi once shared a childhood friendship with a boy named Haru who vanished one summer.
It is most likely one of: