These items are on sale and won't be restocked anymore.
Better get yours quickly before they are gone.
Most of us know this name. It stands for an obsessive fan who is actually just over the top.
Of course you have quite some gradations in the fan level. One is already called otaku by many Miku Hatsune posters and someone else is only called otaku if his or her room is covered every inch with merchandise from Miku Hatsune.
In short, this is the perfect shirt for every fan.