MoonPhase (TV)

Most of the objects seen during the OP sequence are shown as visual puns on 月 ("tsuki", moon). The flowers are 月見草 ("tsukimisou", evening primrose); the bear is a 月の輪熊 ("tsukinowaguma", Asian black bear, or crescent moon bear - so named for the crescent marking on its chest); the baby is in 襁褓 ("mutsuki", diapers); the noodle dish is 月見蕎麦 ("tsukimisoba", soba with egg); the Moon Rabbit is the Japanese equivalent of the Man in the Moon; the rabbits are making 月餅 ("tsuki-mochi", moon mochi) in a 搗き臼 ("tsukiusu", mortar for pounding rice); turtles are said to lay their eggs under the full moon; spraining a finger, i.e. with a ball, is 突き指 ("tsukiyubi"); finally, the word for vampire, 吸血鬼 ("kyuuketsuki", literally: bloodsucker) is also a pun on 月.

Hazuki (葉月) and Luna are also both two moon-related names. Also, the show airs on Monday nights (technically Tuesday morning, but it's listed as Monday, 1:45 am), which in Japanese is Getsuyoubi (月曜日), another moon-related word. Whether or not this was on purpose is unknown.

The pun about the ears that Hazuki wears is that "Neko Mimi" is a Japanese slang term for a catgirl.

In the opening Hazuki luna when says "guru guru..." she transform in Ranze Etō From Tokimeki Tonight.