みずか すすんで
mizukara susunde

Adverb
Expression

1. by choice; of one's own free will; on one's own initiative; off one's own bat

みつなは綺麗 きれい きだから、よく みずか すすんで掃除 そうじをしています。
mitsunawa kirēsukidakara yoku mizukara susunde sōjio shite imasu.
Mitsuna is very tidy so she often cleans up without being asked.