"The Day That Fell in Love" was used as the opening theme for "1/1 Boyfriend and Her."
| Usage location | OP |
|---|---|
| Performed by the singer | ネッタイヤ |
Content and inclusion
"The Day That Fell in Love" was used as the opening theme for "1/1 Boyfriend and Her."
Division of production for the opening theme
The production announcement for SIDE CONNECTION listed this song as the opening theme produced by SONO MAKERS: lyrics by Jin., composition by EP, and arrangement by EP and A-DASH.
Guitar and bass playing
The announcement also credited A-DASH with both guitar and bass performances.
Related entries
- Related works:1/1 Boyfriend and girlfriend
- Performed by:ネッタイヤ
References
- SMEE: 1/1 boyfriend and girlfriend bonus and support
- SMEE '1/1 Boyfriend and Girlfriend' music production announcement
Data compiled on: 2026-10-07.