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a year ago, a friend of mine told me something about a game called "Colorful Heart". I've been looking for it all over, but no dice.

Can anyone tell me what kind of game it is and maybe what some of the storyline is?

It seems that it's another eroge from GIGA (the creators of Variable Geo and Baldr).

This is what it says about the story on the main page of the game... well... with Babel Fish traslation:

The protagonist which begins long-awaited one person living from the origin of the parents whose overseas business trip is many separated. There is also a consequence which is long overseas life it is the protagonist which イマイチ it cannot adapt in the Japanese life, but (exclusively care part of appearance of the protagonist) there is cooperation of childhood friend somehow starts being accustomed to current life and, to the origin of the protagonist which has had enough one person living the girl 12 it was led to destiny (the betrothed) it comes....... Prime mover with the parents of the protagonist, is worried about the protagonist was the conduct which is taken excessively. Furthermore the fact of the matter which proposes the outrageous thing where the day when the protagonist receives birthday (graduation ceremony) to it conveys also the fact that by all means the alone woman is made marrying. Hiding, 3 months, it meaning that strange joint life of 12 betrothed starts in the rear end eye, it does, the protagonist which is perplexed in various circumstances...