Back in the apartment, Luna shows Naoto another secret. Her secret this time is that she owns sexy lingerie, a LOT of sexy lingerie. Luna thought that Naoto would be put off with the idea that a relative of his would own such items, but Naoto was more concerned with the sheer amount of what she had. Luna claimed that she couldn't help herself but buy it when she's told that it looks good on her, mostly likely compliments from the saleslady where she bought them, but it is not explicitly stated who was telling her that. This caught Naoto's attention, and Luna tells him that because guys like these things she thought that if she wore these an unstated someone would like them.
Because of her vague statement, this caused Naoto to imagine Luna wearing them for another guy. Meanwhile, Luna is thinking that because of Naoto expanding his horizons, she would get left behind, she wanted to be biggest existence in Naoto's life so she told him one of her secrets. Seeing Luna getting gloomy, Naoto springs into action. He states that he does not dislike her owning lingerie, that he likes them. Luna, seeing how Naoto just blurted that out without thinking it through, sees through his bluff and decides to tease him. So she tells him that she'll be wearing them to see if he's not lying.
Some time pass, and Luna is shown giving Naoto some sneak peeks, a strap here, some ribbons there, but nothing to outright tell Naoto which exactly she was wearing. Naoto flusters as he can't help but imagine Luna which lingerie she has on, and seeing his reactions, Luna is enjoying herself. The two head out for a late night trip to a convenience store, and they settle at a park to eat.
Luna sits at the swings as she eats her nikuman, and a concerned Naoto asks if she's not feeling cold. Luna jokingly tells him she's fine, and when it comes to it she'll ask Naoto to warm her up, to which he tells her that he'll just give her what he's wearing on top. The two reminisce how they used to play on the swing, and almost fell trying to recreate how to yeet one's shoe off while on the swing. She saves herself just barely, giving Naoto a good view of her panties as she was wearing a skirt. Luna finds it embarrassing, while Naoto apologizes for taking a look. Luna tells him it's her fault, and apologizes for making him see something weird.
Chapter ends as Naoto blurts out that her panties wasn't weird, and that it looked good on her more than he imagined.