The conclusion of the Liminal Border visual novel series. After the countless twists and turns of Part III, Itsuki's business is now a massive success, but all he can see is the need for revenge. Standing on the border between justice and evil, which way will Itsuki fall?

Itsuki has his NEST. But what did he gain—and what did he lose—to claim it?

With a powerful enemy in Shinonome gone, Itsuki and the gang’s business is thriving.

After countless twists and turns, Rave is now a massive success, generating an immense amount of profit and making “NEST” and its operators infamous in the underworld.

However, with that success comes a creeping unease and the frustration and pure rage of losing something irreplaceable.

Right now, neither Itsuki nor his best friend, Tatsuya Yorozuya, cares for the money and status flowing their way.

All they can see is their goal: to take the life of Umon-kai leader Goro Teshigawara.

For that, Itsuki would not hesitate to throw away his life.

Watching his dangerous resolve with growing concern is Rin Akinashi, his business partner and childhood friend.

And looming ever closer is the shadow of Mafia syndicate executive, Luca.

Life? Or death? Light? Or shadow? Revenge? Or...?

The final curtain rises on this hustler’s waltz. One last dance, precariously, along the boundary between evil and justice...