Arigato follows a Dutch-Indonesian grandmother as she spends a day at the beach with her granddaughter, Toet. As Toet goes to play with Koh, a little Japanese boy, long buried war memories, from Indonesia’s Japanese occupation, come fiercely to the forefront. Grandma finds herself on an emotional rollercoaster and ends up confusing innocent events with her traumatic experiences and the death of her father. Indirectly, she reveals her fears to Toet, who trys to dispell them. Koh the little boy, has witnessed all this and makes a small but powerful reconcilatory gesture. Grandma overcomes her aversion and can thank him in his own language: ‘Arigato’.