The Tatami Galaxy by Tomihiko Morimi

The inspiration behind the much-loved anime series, Tomihiko Morimi's contemporary classic is a fantastic journey through time and space, where a half-eaten cake, a photograph from Rome, and a giant cavity in a wisdom tooth hold the keys to self-discovery. A time-traveling romp that speaks to everyone who has wondered what if, The Tatami Galaxy will win readers' hearts over... and over... and over again.