Hyakuen! is a manga series by Ema Toyama."The Spendthrift" Genki Girl Momo Yamada and "The Economist" Stoic Madoka Suzuki are both saving money for their dreams — their very different dreams.Momo wants to save up 10,000 100,000 yen to get a scootermotorcycle license and go to various places with Madoka riding in the back buy a bike (Momo constantly changes her "dream"), but she's horrible at being frugal. Madoka wants to save 1,000,000 yen in order to go see her grandfather in Germany.Will they able to achieve their dreams?
Declaration of Protection: Kazuma towards Madoka. He does a horrible job at it, getting knocked out in one hit while his assistant Touya beats Momo's and Madoka's harassing porn neighbor up. But Madoka does thank Kazuma for the effort, but hilariously gets taken away by the police, who mistake Kazuma for the porn neighbor.
G-Rated Drug: Momo getting drunk off of oolong tea in Chapter 9.
Green-Eyed Monster: When Madoka apologizes to Kyouka for thinking she was "like any other rich person," Chise suggests that maybe Madoka was jealous of Kyouka because of her friendship with Momo. Madoka hastily denies it.
After eating somen for three days, Momo and Madoka (and the rest of the gang) enter a swinsuit contest — turns out to be a "Best Housewife Contest." Momo and Madoka are runner-ups in the end and their prize were... a month's supply of somen each.
Kazuma and Touya move into the apartment next to Momo and Madoka.
In spite of always being a spendthrift (and at one point had to survive on 1,000 yen for it), Momo beats Madoka in saving enough money for her dream. Justified in that Momo's money goal was much less than Madoka's, but Madoka was ahead of Momo from the start and is much more frugal than her.
The Nicknamer: Momo's taken to calling Toya "Black Person" because of his dark clothes.
No Guy Wants to Be Chased: Gender-flipped with Madoka and Kazuma. Madoka is generally put off by her absolutely smitten fiancÚ Kazuma, more because of it being an arranged marriage set up by her parents and less because of Kazuma himself (though she does find him very annoying). She gradually thinks of him better after he attempts to protect her, but continues to find him annoying.
Nosebleed: Touya, of all people, when he is often exposed to Momo's... figure. And again when Kazuma and he can overhear the girls from their side of the public open bath, and their conversations get so steamy that Touya makes a "bloodbath" in the male public bath. It gets worse when Touya gets another eye view of Momo's breasts when she's following Madoka out of the public bath, and Madoka loses her towel which Kazuma sees, and Kazuma and Touya end up hospitalized for "severe blood loss." Ah well, at least Kazuma is happy.
Poor Communication Kills: In the most hilarious way possible. Chouko's attempt to relieve Kyouka's anxiety in the public bath via writing "ochi-tsuke" ("calm down") as a pass along to each person turns hilarious when Momo gropes Kyouka, thinking that's what Chouko was passing along, mistaking "ochi-tsuke" for "chichi-mome" ("grope her boobs"). As it turns out, everyone got Chouko's message wrong. It's still endearing because Kyouka manages to ease up and the gang ends up having fun.
Kazuma attempts this when Momo's and Madoka's porn neighbor is harassing Madoka, but fails. Luckily, Touya is there to beat him up.
Before Kazuma's family became rich, they lived a poor, homeless life. When Kazuma was getting bullied in elementary school, it was Madoka who defended him — or rather, defended his homelessness, anyway. Afterwards, Madoka took the time to hang out with Kazuma, leaving Kazuma thankful for her kindness in spite of his circumstances. Unfortunately for him, Madoka doesn't remember any of it.
The Rival: Chouko Nakata towards Madoka, but she's more of an Unknown Rival because Madoka tends to ignore her.
Romance Ensues: Momo takes Touya (who she's taken to call "Black Person" because of his dark clothes) and they leave so that they can let Kazuma and Madoka have their "emotional reunion." However, nothing comes of it, as Madoka has no recollection of having a Rescue Romance with Kazuma.
The Runaway: Madoka, having ran from home following a fight with her parents.
Kazuma. Lampshaded by their class when he mentions transferring to Madoka's class to find her, spending a month looking for her, and spending three hours looking at the mirrors merely because he get to see her.
Momo's and Madoka's porn neighbor is a literal one for Madoka, eavesdropping on her conversations and even breaks into their room to play with... Madoka's "unmentionables." Naturally, Momo and Madoka are squicked out. He later gets arrested.