Wow!

Did Himiko make this or something?

Whatever! It's cool! And true!

Accept Rantaro's spot! He's the Ultimate Adventurer! Remember? It's written in his free time events!

He has a rich family and does a lot of adventures. He then took his sisters and step sisters on them. He then lost all 16 of the girls while exploring. He now feels that it's his job to find all 16 of them.

Rantaro in my opinion is in the "Very unlikely but not impossible" section.