An Unlikely Passion
The quest is unlocked after completing The Master Kohga Chronicles! quest.
"A Yiga footsoldier dreams of studying ancient tech, but it's distracting him from his duties. Master Kohga figures he might as well give him an oldfangled doodad so he gets it over with..."
"The Yiga Clan member received Master Kohga's gift with a mixture of joy and utter amazement. In the end, to focus on his Yiga duties, he decided to give the item to the Ancient Tech Lab."