Japanese companies are expanding in India, making it one of the busiest corridors for dealmaking in Asia, particularly in financial services. Just Wednesday, Mizuho Financial Group Inc. said it is buying a controlling stake in KKR & Co.-backed investment bank Avendus Capital Pvt. Bigger rival Mitsubishi UFJ Financial Group Inc. might invest more than ¥500 billion ($3.2 billion) to buy about 20% of Shriram Finance Ltd., people familiar with the matter said earlier this week. Sumitomo Mitsui Financial Group ...