What was up with Anri's brother? [SPOILERS]

[NowBobCat]

This is the one thing I couldn't find an explanation for (other than why Q84 was executing everyone on live TV) is Henry Warhol. He was only mentioned in the False realm, and all that was said was that Anri killed him but her parents still loved him more? Seems to come from nowhere and leads to nowhere, especially since it has no True Realm equivalent.

[F IAaP n]

He's an obvious otaku and a spoiled brat, and in Anri's eyes he's akin to a literal "human garbage" – he gets everything he wants (games, figurines, etc) on a silver platter while Anri on the other hand is met with harsh expectations from the parents. They're far from rich, but the parents still spoil Henry while being strict with Anri – unfair, isn't it?

He has an appearance in Heaven's Gate spinoff, but it's so minor that you won't learn anything new of him, really.

[Milk Tea]

In the true realm, after Anri complains about Henry and her life, Charles thinks that he never even met her brother and that he could be a corpse for all he knows.. so we really don't know anything about him, because neither did Charles xD