To start with, Lost Legacy from Seiji Kanai and Hayato Kisaragi is a game, a pair of games, and a game system all in one. The initial Japanese release included two separate games in one box, with the cards being both interchangeable and combinable, and a third Lost Legacy game was given at Game Market as a promo item that you'd cut apart yourself.
The designers and publisher One Draw have released two subsequent Lost Legacy games — Lost Legacy: Hyakunen Senso to Ryu no Miko and Lost Legacy: Binbo Tantei to Inbo no Shiro — with each consisting of two standalone (but combinable) games. (Lost Legacy Legend, which will debut at Tokyo Game Market on Nov. 16, is a set of eight(!) games from designers who are riffing on the LL format, but that set is Japanese-only, unlike the previous LL releases.)
• As is the case with many releases from Japon Brand, Hisashi Hayashi's Isaribi debuted at Tokyo Game Market in the middle of the year, then was later brought to the larger market at Spiel in Essen — although the game sold out via preorders long before Spiel even started, so it's not like the game even received a full debut. Maybe someday...
• KogeKogeDo's The Edict of King Budeaunia from designers Sayaka and Takahiro mimics Thebes in that players dig through dirt in order to find things, but in this case players can find monsters and hot springs as well as treasures. Okay, finding monsters might not be so good for you...
• I've played Katsumasa Tomioka's Ninja Taisen four times now on a press copy from Japon Brand and found it a great little take on RPS, with each player having the same forces and trying to plan for advances and attacks as well as is possible given your reliance on the die rolls each turn.
• Masanofu's See-Know-Buzz from Yū-gen Roman is a supremely odd minimalist card game in which you're trying to overpower the other players, but you're not exactly sure (at least some of the time) what your power might be, with bluffing and deduction both coming into play as you figure out when to duck and when to attack.