Crush the chocolate cookies in a food processor until they resemble fine crumbs. Mix with melted butter and press into the bottom of a greased springform pan. Refrigerate to set.

Beat the cream cheese and sugar together in a mixing bowl until smooth. Add the eggs one at a time, mixing well after each addition.

Stir in the orange zest and juice, followed by the vanilla extract until everything is mixed thoroughly.

Melt the chocolate chips in a microwave-safe bowl, then fold into the cream cheese mixture until fully incorporated.

Dissolve the agar-agar in a saucepan over low heat, then mix it into the filling. Ensure it is evenly combined.

Pour the filling over the crust and bake in a preheated oven at 325°F (160°C) for 55 to 65 minutes. Cool gradually to prevent cracking.

After cooling, chill in the refrigerator for at least 4 hours or overnight.