A removable downspout system for use with conventional gutter systems includes a spout mated with a gutter of the gutter system, a box mated with a downspout for the gutter system, and components for removably mating the downspout fitted with the box to the gutter fitted with the spout. Whether or not the player’s input sound coincides with a reference melody set for an egg OB selected for causing a character to be created is determined based on the detected notes, and the character set for the egg OB is created when the input sound has been determined to coincide with the reference melody. A locking portion on an inner surface of the flexible lock is locked to a lock-receiving portion on an outer surface of the male housing to lock the lever at a fit-in position. The helicopter design also includes a main rotor tilt system which tilts the rotation axis of the main rotor forward during high-speed flight to improve the aerodynamic efficiency of the helicopter airframe and rotary wing. The accessories can be engaged to the extension bayonet via one or more accessory mounting brackets. By using inexpensive high-purity copper and inexpensive chlorine, hydrogen chloride, or chlorine and hydrogen as source gases, a copper film containing no residual impurity such as carbon and having high film quality can be formed with high reproducibility.