|"Apparently I mistranslated Shoggoth as Chocolate, my ba-GWAAAH!"
"Nerd-Annihilating Cool Cat Punch!! Aaand KICK!!"
Shiro and Sitri both have powers related to Connection. But somehow as a result of the two's accidental collaboration, a bizarre chocolate slime creature has been created?! The recipe Shiro was following in his efforts to create chocolate were apparently a ritual for summoning creatures known as Shoggoths in the world of Old Ones. Sitri responds to Shiro's blunder with an intense tsukkomi punchline.
It is highly likely that Sitri's power has influenced this unusual lapse in judgment.
As an aside, it seems that the relationship between Shiro, who likes to make sweets, and Sitri, who likes to eat sweets, has surprisingly continued.