I love Initial D.
But it really pains me that they are so cruel when it comes to relationships.
The Extra stage 2 deals with Iketani and his feelings for Mako.
I don't think it's very important for the storyline, however its a nice sidestory and it will probably give you feels.
If you like Initial D I highly recommend this stage which is rather refreshing cause the focus doesn't lie within racing this time.