- Yuriko Asai: "Seventeen." It's got such a nice ring to it!
- Tomoko Asai: What are you talking about? If you really went back, you'd find yourself sick of it. Being young means being lonely, being humiliated, handling things clumsily, being hurt - a lot, all the time... That's why you'd get tired of it.
- Shôhei Asai: When I want to boost my confidence, I think about the ways I'm better than Ken-ken. Unlikely as it seems, there are three. First: I'm nicer. Second: I'm not very picky. Third: detailed knowledge of the manga "Sankokushi." On the other hand, he beats me in pretty much everything else: height, eye size...
- [Sho eyes Ken-ken's crotch]
- Shôhei Asai: ... academics, athletics, even in romantic relationships.
- Kengo Iwasaki: [after getting caught making out, Sonoko and her father leave, swearing she and Kengo will never see each other again. Kengo turns to his mom] Sorry.
- Kimiko Iwasaki: Idiots. Goddamn bourgeoisie.
- Shôji Enami: [to Kouji] You be careful too.
- [smacks the back of Kouji's head]
- Nobuhito Udagawa: [to Hayato] I'm sure I don't have to worry about you.
- Hayato Udagawa: It's not that I can't. I chose not to.
- [His father, Nobuhito, knees him in the stomach]
- Hayato Udagawa: Thank you.
- Shôhei Asai: Sure I want to do it too. But... this... It's... It's just... Shouldn't it be more... meaningful? You find someone you like. You fall in love. They mean something to you. It should be more... I... I'm through. I don't want to do it like this. It has to be someone I care about.
- Hayato Udagawa: Once sex was sacred. It wasn't something you talked about in public. But now if you don't do it you're considered weird! Isn't that horrible?
- Shôhei Asai: I guess.
- Hayato Udagawa: That's what Chris and Amanda say.
- Koji Enami: [to Kengo] And who are they?
- Hayato Udagawa: [hands magazine to Kengo] "Newsweek". Thanks.
- Kengo Iwasaki: Did you like it?
- [opens to article titled "Saying No to Sex: A Teenager Revolution"]
- Koji Enami: [to Kengo] You gave it to him?
- Hayato Udagawa: In this troubled world, we have the power to live with some dignity! Dignity is chastity!
- Shôhei Asai: What the hell?
- Hayato Udagawa: Chastity stickers! Take one.
- Shôhei Asai: I'm not a member.
- Hayato Udagawa: Just take it! Here, put it on your cell phone. And on your underwear, of course. It will protect you! Prove your allegiance!
- [offers stickers to Kouji]
- Hayato Udagawa: Here.
- Koji Enami: I don't want it.
- Kengo Iwasaki: [accepting stickers from Hayato] Here.
- Kengo Iwasaki: You actually want one?
- Hayato Udagawa: We CPG
- [Chastity Protection Group]
- Hayato Udagawa: members will stay pure until graduation. No exceptions! Betrayers won't be forgiven!
- Shôhei Asai: You're scaring me.
- Hayato Udagawa: For now, keep your Johnson in your pants. No flying solo either.
- Shôhei Asai: That's too much!
- Koji Enami: You know, I cry myself to sleep every night.
- Hayato Udagawa: Rub salt in your eyes!
- Kengo Iwasaki: Incomprehensible.
- Hayato Udagawa: From now on, it's guys only.
- Shôhei Asai: What?