The main story of Oshi No Ko may be on hold while author Aka Akasaka takes a break, but artist Mengo Yokoyari has a few surprises in store for longtime manga readers in the short interlude arc. This arc's short chapters are more than filler episodes or bonus art collections – they are an opportunity to explore Oshi No Ko's best characters and themes from entirely new angles, most of all with Aqua and Ruby Hoshino. The interlude shows what they could have been like as a true brother and sister in another lifetime, a lifetime free of drama and tragedy.
Source：https://www.cbr.com/oshi-no-ko-interlude-aqua-and-ruby/
