This is The Reflections of Oregairu – Genuine, End Girl, The Final Story, Their Past, & More (anime Zoku ep4). Now WW makes “the sign” to point to a certain important event. Irohasu is the best!!
The Reflections of Oregairu – Finally, Genuine, End Girl, & More, Were Revealed. [Yahari Ore no Seishun Love Come wa Machigatteiru. Zoku Anime Episode 4]
Iroha is so cruel (but cute), she makes the sign so we’ll know that love triangle or the cold war.