Aki’s favorite game is
playing with your shoe!
The grid under each letter represents a decimal number as shown in hint 3, the first and second numbers being 104 and 232 respectively. Then dividing each of those numbers by its above number represented by the Greek letter in the Byzantine numeral system we have the following decimal numbers.
104 116 116 112 115 58 47 47 119 119 119 46 121 111 117 116 117 98 101 46 99 111 109 47 119 97 116 99 104 63 118 61 101 89 100 108 78 84 84 114 73 83 65
Converting this to text gives
https://www.youtube.com/watch?v=eYdlNTTrISA
where we find the good boy doing what he loves.