Answer:
神 SHIN, JIN, kami - god
葉 YOU, ha - leaf, foliage
睦 BOKU, mutsu(majii) - friendly
皐 KOU, satsuki - waterside, marshland
霜 SOU, shimo - frost
They are the characters used for months in the old Japanese calendar.
神無月 (kannazuki) October
葉月 (hazuki) August
睦月 (mutsuki) January
皐月 (satsuki) May
霜月 (shimotsuki) November