Sign wa B is an idol song associated with B-Komachi in Oshi no Ko, and this clip isolates its B-chorus, the catchy section fans often replay and share. The song's bright idol style fits the series' focus on performance, fame, and stage presence, which helps explain why short excerpts circulate widely in anime edits. Creators reuse the chorus to signal celebration, confidence, and idol energy, keeping it popular in fan videos long after first hearing it in the series.