Aimer feat. RADWIMPS "Butterfly Knot" or "Bunny Ears" 蝶々結び (English subtitles)

While the song title is literally translated as "Butterfly Knot", I translated it here as "Bunny Ears". The lyrics are literally about a parent teaching their child to tie their first shoelace knot (typically "bunny ears"), but metaphorically the lyrics are about building (and sometimes breaking) relationships.
*Translators note: The thread they reference in the lyrics is the red string of fate, often seen as an invisible link between two people who are destined to meet and fall in love. However, the lyricist explicitly rejects this idea of fate and states that the two made their own string and pulled each other together through their own efforts (See wikipedia article: Red_thread_of_fate for more info on this concept).