I don't really get something here...

In japan. If student graduate. 2nd button uniform of male students usually given to the person they love. 2nd button could be considered as confession. Because 2nd button is closest to heart. This custom of 2nd button in Japan is influenced by a novel and became habit of graduation day when people confess

Oh... that's cain'da cute I guess. But a little troublesome, especially if more than one girl wants it. Here's a better idea. Wanna confess? Give the person you're 2nd button. Na!? LOL

It just if there are many girls want it, the guy should just give it to the girl he likes. Or refuse just like Takeo did.
Hmmmmm... if I live in japan, I will give whatever button to confess and say it as 2nd button

LOL! OH WAO THAT'S SO MEAN! LOL Smart put not very nice. Don't you think one is enough, then it's just to much trouble. Girls tend to be a pain in the ass, I should know.

i dont understand YA! WTF U DONT CARE! TWO RIVER FLOW IN ONE SEA ARE FOCKING SICK! it's like "OI BRO U DONE ME, NOW IT'S MY TURN" in relationships between FEMALE AND MALE woman can FCK man too LITERALLY by DILDO the problem that IF THAT MAN IS A CHip WHORE and will let it DO to him! AND if both like to be DOME they are BOTH WHORES! NO SECOND NO TOPS it's just the way u FEEL toward this relationship! IF U LIKE PERSON U WILL LET HIM DO WITH U ANYTHING IN DA BED! ヽ(`Д´)ﾉ

Ok, OK lol I fell like your biting up. Hey I'm all for, what ever in the sack, even if it's a 3 ppl job. I'm just saying that, if I want a someone, spatial or not, one should be enough, even if it's just a month.

I'm Japanese and I went to junior high and high school in Japan. I think giving the second button doesn't necessarily mean a confession in the boy's part.
I think boys try to leave the second button for a special someone, or for girls they prefer most, but giving a second button is more like a keepsake and memorial to give to a girl to comfort her, since the boy's graduating and their ways are going to part. I think that's why the girl in the story was angry. She thought he should have at least given her mercy, and handed her the button to console her.
And the custom is to rip off the button in front of the girl so you can't really fool her about the number of button. Back in junior high, popular boys who were graduating had none of his button left, because girls were all over him and they were asking for what was left of his buttons.

Ohh..... C wen you put it that way, I get it. A keepsake, that's met to be a tough full. Back wen I graduated from HS we took pics of friends and teachers and made our own personal picture book.

A novel? I thought it started during WW2.

Really? So the girls in japan actually flocking around popular guy? Like manga? Or just in graduation day? I mean, I can't imagine people gather around popular guy or girl because they idolize them. But friends flocking around is normal I mean not in idolize them. But thank you for your explanation :D

I read about this 2nd button custom somewhere. And I don't remember if it during, before or after WW2

Right! That's what I was thinking. It was just a little bit odd to me that's all, they're just some guys that you might not ever c again, so why tack he's button and not a picture?

I will definitely choose to take picture, because we can remember them when we look at it. But I m pretty sure I will say, whose button is this? Lol. Okay. Maybe it just different custom on different country :D

Yeah, every were there's different traditions. A personal picture with the cute someone that I used to like, is the best way for me to remember them...

Here's something I found in another manga.
http://www.mangago.zone/read-manga/hidoku_shinaide/tr/v01/c016/pg-34/

See, Maya lost all his buttons on his graduation day.
It's just a tradition in Japan. And we also take pictures too.

One more thing.
The reason why the second button is special, is because it's closest to the heart. It's supposed to be romantic, though I never believed in it myself.

Yeah I herd about that one. ╮(￣▽￣)╭