I love Ajisen--I spent about three out of five days of the week here when I was in high school. I eventually ended up having my 17th birthday party here and had about 30 people invade the place--the waitresses were really nice and decorated the restaurant with banners and birthday swag saying "Happy 18th Birthday"! Everyone here has always been cordial with me and orders come pretty quickly. I also love the pink...everything! I definitely wakes me up.
Food is pretty mediocre, I have to say. For around 5-10 you get a large bowl of ramen that will fill you up. What else can I say? I also recommend trying some of the snacks/sides as they are pretty good.