For mang about beauty of the true frendship, its surprisingly mean-spirited. Moe is obsessed with Eiko, and Eiko is pushover for Moe. It's not friendship, it unhealthy addiction!
Moe is also cruel. She uses Eiko as the excuse to ditch the boys who like her, treating them like garbage. Insted of, i don't know - telling them she's not interested? For such 'foul-mouthed and rude' girl she's typicall 'i won't tell you what i think!' shoujo stereotype.
Eiko is typicall pushover. She let's her fiend use her and treat her like a convinient exuce to ditch another boy. She's manipulated, really cruelly when we're at it, by Moe: who would not blame themselves after hearing situation from first story?
The way friendhips is shown here it's just unhealthly.
The boys are done better, but not that much. One is pure perfection cut-out from Book of Shojo Stereotypes, and the other is the opposite cut-out. They both act stupid, but at least its nothing too bad, and the latter one even have some believable reasoning in his little grudge against Eiko.
Bonus story is only good thing here, because at least when the character acts stupid/clingly/unhealthy it IS said in the story instead of showing it as normality.
Overall, it's sad that a really nice art is waste don such stupid story. And it's frightening than anyone would think that relationship in this story is anything even remotely close to normal.