Otakus. Or, rather, an Otaku called Conspiracy.

Words that you can practice writing with only the first hiragana – the vowels and the k sounds. (a, e, i, o, u, ka, ki, ku, ke, and ko)

koe – voice
kaku – write
oke – wooden bucket
kao – face, honor
ie – house, extended family
aki – autumn
iu – say
akai – red
aoi – blue
kioku – memory
ekaki – painter