With so many competitors in the tablet and e-reader market these days, it’s getting harder and harder for manufacturers to differentiate themselves from similar offerings. Apple’s iPad held 68 percent of the worldwide market share in the second quarter according to Massachusetts-based research firm IDC, while Samsung and Amazon claimed second and third with 10 percent and 5 percent respectively. While it can be hard for newcomers to get a foothold, there are a few new offerings from Japanese companies that aspire to take a bite out of the e-reader apple, so to speak.