Train Fujoshi

BL fangirl from a school nearby (近くの学校の腐女子), or Train Fujoshi as the fandom more often calls her, is a minor character in both Sasaki and Miyano and Hirano and Kagiura.

A recurring gag character, she tends to appear in the background rejoicing or breaking down when Sasaki and Miyano are sharing a moment together on the train or in the train station. She is often accompanied by her dark haired friend, who never understands why her friend has these breakdowns.

Manga

 * Volume 1: In the Cultural Festival extra of chapter 5, she overhears Sasaki calling Miyano cute when wearing an apron during the school festival, and wonders if she misheard.
 * Volume 2: In the extra chapter, she is seeing sitting a couple seats away from Sasaki on the train in the morning. When Sasaki begins to leaf through Miyano's BL novel, she has one of her famous breakdowns.
 * Volume 3: In chapter 15, she sits next to Miyano on the train. When Miyano coughs, she looks at him puzzledly.
 * Volume 4: In the extra chapter, Sasaki wonders if people will think he and Miyano are dating when they are seen walking home together. Miyano says people will just think they are normal students - but in the final page it is revealed Train Fujoshi is walking behind them, thinking they are dating.
 * Volume 5: In the extra chapter, she witnesses Sasaki and Miyano ruffling each other's hair while they are waiting for the train to arrive, which results in another breakdown.
 * Volume 6: She briefly shows up in chapter 28 as Sasaki and Miyano talk about the Sasaki's entrance exams. On the hidden cover, we see that she was eating ramen with her friend in the same restaurant as Sasaki and Miyano were in chapter 33. Seeing Miyano taking Sasaki's necktie off causes her to stop breathing.

Novel

 * Chapter 4: Though her name is not revealed, it is implied that she is the one who walks in on Kagiura and Hirano falling down in the haunted house.
 * Extra chapter: She is seen with her friend walking around the school festival and taking part in some activities (the same festival as chapter 5 in the Sasaki and Miyano manga).

Manga

 * Chapter 6: She is seen with her friend at the all-you-can-eat dessert cafe that Kagiura and Niibashi visit.