Two

Two is the 4th stage station planet on the Isekandar Highway, a part of a nebula star cluster but not really known for many tourist spots. Visitors can see a statue of Hachiko with its owner, professor Richard Eizaburogiya. The only other known fact about this planet is that it has a branch of a certain known fast food chain with red logo and yellow lettering.
It was visited in drama CD 5.

Trivia

Two is named after Tsu, which was also a station of the original Isekaidō.