Susumu Koyama’s Chocology is a collection of four chocolate bonbons by Es Koyama, a Japanese chocolatier based in Sanda, Hyogo Prefecture. Introduced in Japan in 2025 under the theme Echoes of the Inner World, the collection draws inspiration from four fragrances created by Francis Kurkdjian for the Parisian perfume house Indult Paris.

Susumu Koyama studied how each fragrance evolved over time and recreated that progression in chocolate using tea, fruit, honey, and spices. Isvaraya combines aged pu-erh tea, jasmine tea, and plum with an 18-year-aged Nanko Ume plum liqueur. Tihota brings together the warm aromas of Tahitian vanilla, tonka bean, and rum, complemented by jasmine tea and orange blossom honey. Manakara pairs lychee, raspberry, and Bulgarian Damask rose with green cardamom and Madagascan vanilla. Cuir combines Earl Grey tea, hazelnut, black cardamom, and clove, with yuzu and dark balsamic vinegar adding brightness and acidity.

The bonbons can be tasted in the order presented in the collection, beginning with the tea and fruit notes of Isvaraya, moving through the warm vanilla of Tihota and the floral and fruity Manakara, and ending with the spiced finish of Cuir. Koyama designed each bonbon so that its aromas unfold gradually and shift through the finish.