lily of the valley
Convallaria, a poisonous, woodland-native, flowering plant native to cool temperate climates in North America, Europe, and Asia. Its Japanese name is 鈴蘭 / スズラン (suzuran) and its Chinese name is 鈴蘭 / 铃兰 (Linglan).
The flowers come in clusters, dangling from curved, alternating offshoots from a main stem (aka raceme) and are bell-shaped and (usually) white. All parts of the plant are poisonous, including its red berries.
Often associated with the character Medicine Melancholy. Not to be confused with bellflower whose flowers typically have a longer, less rounded bell shape.