The ingredients list mentions toasted black sesame seeds but they aren’t mentioned in the directions. What are they for?

Here's the original via BuzzFeed and Google translate.
Some recipes use the black seeds in the crust and the black sesame paste to make the dark part of the marble filling. Butter also goes in the crust.
Good luck - sounds delicious!
https://www.buzzfeed.com/jp/sonomishimada/sesame-marble-cheesecake?utm_term=.ubojj5ARV#.bs9nnrDmw

The directions also say to put butter in the crust but it is not listed in the ingredients.