Vocabulary consisting only from characters you are able to read
思いつく
omoitsuku
to think of, to hit upon, to come into one's mind, to be struck with an ideagodan, jlpt3, verb
来日
rainichi
arrival in Japan, coming to Japan, visit to Japanmix
下る
kudaru
(1)to descend, to go down, to come down, (2)to be handed down (of an order, judgment, etc.), (3)to pass (of time), (4)to surrender, to capitulate, (5)(often in neg. form) to be less than, to be i godan, jlpt3, verb, vintrans
いつの間にか
itsunomanika
before one knows, before one becomes aware of, unnoticed, unawaresjlpt3