毎年: every year

毎年まいとし夏なつには海うみへ泳およぎに行いく。

Every year in summer I go swimming at the sea.

わけを聞きくと、「ヤマタノオロチという大おおきな蛇へびが、毎年まいとし来きて、娘むすめを食たべます。もう七なな人にん食たべられて、この子こが最後さいごの娘むすめです」と答こたえました。

When he asked why, they answered, “A giant serpent called Yamata no Orochi comes every year and eats a daughter. Seven have already been eaten, and this child is the last.”