Assuming you didn't catch the name
> of it a week or two
> > ago, th
> > e title is "Isekai no Seikishi Monogatari".

Or known by it's short title for the last 6 or so years... "Saint Knight."

And, yes, that is one of Tenchi's relatives... from the little I could get out of
the first episode, now watched both raw and subtitled... the best I could determine,
is that he was kidnapped in "our" or Tenchi's normal universe (the base Kajishima

universe), and forced to pilot the suit, with the promise being that he would be returned
home when he completed the mission he was given.  However, there is enough info missing,
that he might have "accidentally fallen" into the other universe, and
was captured at that point or shortly after.  That's another reason why it was reminding
me strongly of Aura Battler Dunbine.  If a little sprite starts to harass him...