Responses
I think there's a cultural aspect to it - Japanese culture places such a high priority in the wellbeing of the group over individuals. I've read many stories of someone quietly estranging themselves from their family due to some kind of conflict or potential for conflict. By doing so, the peace is maintained. I could be wrong but it's a pattern I've noticed over the years.

Cute couple and I like Sena's style, but lol really just ditched your family over a conversation you overheard? And like had his brother ever reached out? Drives me crazy when they just jump years away like whoops, lost all that time for nothing, oh well.
But sure, Sena is adorable so we forgive him.