Mizuto and Yume used to date, but now they've suddenly become stepsiblings. Both of them agree that they don't want to do anything that'd disappoint their newly remarried parents. However, neither of them can accept the other as being the eldest sibling in the relationship. So they both agree to settle the matter with a game. Whoever does something in conflict with what people might consider normal sibling behavior, loses. Making them the younger sibling.
Anyway, shouldn't you be more
 focused on making friends?
على أيّ حال، ألا يجب أن تركّزي
أكثر على عقد صداقات؟
Du solltest besser Leib und Seele
daransetzen, Freunde zu finden.
Deberías preocuparte
en hacer amistades, ¿no crees?
Deberías preocuparte
en hacer amistades, ¿no crees?
Pense plutôt à te faire des amis.
Ce sera ta nouvelle vie
In ogni caso, non dovresti essere
più concentrata sul farti degli amici?
De qualquer forma, você não deveria
estar mais focada em fazer amigos?
Кстати, тебе лучше подумать,
как завести друзей.