TOKYO (Reuters) – Yahoo Japan Corp said on Thursday that it would buy mobile and broadband provider eAccess Ltd from its parent SoftBank Corp for 324 billion yen ($3.17 billion) in a bid to expand its services for tablets and smartphones. SoftBank, which owns about 42.5 percent in Yahoo Japan, said in a separate statement that it would book a special gain of 55.7 billion yen for the fiscal year ending March 2015. ($1 = 102.3100 Japanese Yen) (Reporting by Dominic Lau and Sophie Knight; Editing by Jeremy Laurence)