All the latest ramen magazines say that shrimp ramen is a major trend. I have to agree. There are a dozen or so shops in my area going this route. Nearby Gonokamiseisakujo is one of my top shops.
Momonga's take is a winner. Thick soup, a touch of yuzu citrus, and plenty of dried sakura ebi for that extra shrimp kick.
There are non-shrimp options, for those with an aversion.
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Tokyo, Shinjuku-ku, Kabukicho 2-24-7
Closest station: Shinjuku
Weekends until 22:00