It's day one of the festival, and Rimuru finally gets to see all of his friends' performances and presentations. As he's enojying the festivities, he's summoned by Luminus...
You can consider this 
an expression of my gratitude.
يمكنك أن تعتبر هذا عربون امتنان منّي
Considère cela
comme mes remerciements.
Prendilo come un modo per ringraziarti.
Pode considerar isso uma
expressão da minha gratidão.
Считай, что так
я выражаю свою благодарность.