One of the most popular idols in the netherworld, Kuromu-chan, holds an all-day concert at the Makubari Dome. Dem-dols have the important job of helping demons release the stress and evil desires they feel during their Evil Cycle. Kuromu was considered a shining new star in the field, and her tickets would usually sell out in one day. But she actually had a secret that she couldn’t tell anyone... Iruma just happened to be lucky enough to get tickets for her concert and takes Asmodeus and Clara with him!
Meaning the leftover tickets 
might've gone to waste.
.ما يعني أنّ التذاكر المتبقيّة كانت لتُبدّر
Aber die übrigen Konzertkarten
wären doch zu schade.
No quería desperdiciar las entradas,
No quería desperdiciar las entradas,
Du coup,
les billets allaient être perdus.
Il che vuol dire che i biglietti 
rischiavano di andare sprecati.
Então os ingressos seriam desperdiçados.
Ну а раз так,
жалко выбрасывать ненужные билеты.