Matsuyama to Tokyo

Dear expert.
I planing to go from Matsuyama to Tokyo on dec 15.
Hyperdia give me this itenerary:

MATSUYAMA(EHIME) - TOKYO 06:06 pm Dec/2012/15 Departure
Route1
Take time: 692 Minutes Transfer: 1 Times Distance: 956.5 km
Total:¥ 22,650(Fare:¥ 11,900 Seat Fee:¥ 10,750) Commuting ticket(1mon:¥ --- 3mon:¥ --- 6mon:¥ --- )
UsefulLink Time Route Fare Seat Fee Commuting ticket
1Month 3Month 6Month
19:36
begin MATSUYAMA(EHIME) [ Departure track No.1 ] Station timetable | Add to favorite
[127 Min] through LTD. EXP ISHIZUCHI 32 Train timetable | Interval timetable

21:43
21:45
overtransfer SAKAIDE Station timetable | Add to favorite
¥11,900
[563 Min] through LTD. EXP SUNRISE SETO Train timetable | Interval timetable
07:08 end TOKYO
[ Arrival track No.9 ].

ON connection @ Sakaide it has a sign Yellow square with a U shape blue arrow inside and have only 2 min time for connection.
What does it mean? and is it doable?
Thanks.
Victor.