History Manga / GatherMysteryResearchClub

* LoveConfession: [[spoiler: Out of nowhere, in Chapter 357 [[spoiler: "The Mystery of Being Serious" Suzu gives Daisuke a Valentine's Day chocolate in the shape of a heart and bluntly tells him, in all seriousness, that she likes him. This shocks Chiaki, Kotone and Nonoka enough that they also confess their feelings for him.]]

** Even Suzu occasionally falls into this, such as the time she offered to help one of her classmates with her manga by drawing a monster. Daisuke later points out that her beloved monster was getting beaten up by said manga's protagonist, causing Suzu a small amount of [[MyGodWhatHaveIDone mental damage]]. In Chapter 291 ("The Mystery of Cursed Bras"), she gets her hands on a cursed bra, and the rest of the chapter is taken up by the other members trying to get it off her after she puts it on.

** At the end of chspter 353, [[spoiler: Suzu trips and falls against Daisuke, and it's implied the ghost of her mother might've made it happen.]]

* MoodWhiplash: Chapter 353 starts with the usual "Suzu wants to fine a ghost" jive, but midway through [[spoiler: she reveals the "ghost" is her mother, who died in a car crash.]] This is not played for laughs at all, with even the author notes for the previous volume mentioning that "something somber would be revealed".

* FreudianExcuse: Out of nowhere, Chapter 353 ("The Mystery of Graveyards") has Suzu tell Daisuke why she is so obsessed with the occult: [[spoiler: Not long after her mother died in a car accident, she began hearing rumours of a woman's ghost being spotted in the area and thought it might be her mother. However, no matter how much she visited the graveyard she saw nothing and concluded she simply doesn't have a sixth sense that would allow her to see the alleged ghost. As a result, she developed an obsession with the occult hoping it would eventually let her see for sure if the rumoured ghost was really her mother.]] This is not played for laughs at all, with even the author notes for the previous volume mentioning that "something somber would be revealed".

* MaybeMagicMaybeMundane: Matsuko in a nutshell. Things genuinely seem to happen to Suzu's benefit (and other people's detriment) when Matsuko is involved. Daisuke tries not to think about it too hard, especially after the time Suzu lost her in the snow but then found her in a place Daisuke '''knows''' he'd thoroughly searched.

* ACupAngst: Suzu is painfully aware that she's nowhere near as well-developed as Kotone, Asahi-sensei or Reiko.
** Chiaki is occasionally bothered by the fact that her bust size is not that far from Suzu's, and certainly no match for Kotone.
* BeautifulAllAlong: Nonoka walks around wearing a lab coat (to carry her various mixtures) and huge glasses that pretty much cover most of her face. When she takes off those glasses, however, she's very cute. Daisuke is genuinely stunned when she first takes off her glasses in Chapter 76 to thank him for an RousingSpeech he gave her.

* ChekhovsGunman: Nonoka Hiratsuka is first seen in Chapter 38 on a school newspaper describing the disbanding of the Science Club. She later appears in person in Chapter 48 and finally joins the Mystery Research Club in Chapter 76.
** Similarly, Daisuke's classmate Ryouko Tanaka initially appears in Chapter 66 as part of a gag where Newspaper Club president Kaname Yoshizawa takes her place in class. She later reappears in Chapter 95 (fittingly titled "Mystery of Tanaka-san") and has become a regularly appearing member of the cast.

* TheDreaded: The Mystery Research Club as a whole are feared by the other students and staff. Of the individual members, Chiaki is known for her brute strength, Suzu and Masako are avoided like the plague, and Nonoka is almost always carrying some sort of crazy concoction with her. Only Kotone seems to be viewed positively as a SchoolIdol.

** Chiaki and Reiko are on first name basis, partially due to the fact they're both Second Year students.

* LonersAreFreaks: Suzu seems to accept this is her lot in life due to her obsession with the occult. The fact she carries Matsuko, a cursed doll, wherever she goes reinforces this.
** That said, she genuinely is happy when she makes a new friend like Daisuke's sister Yui or when people make an attempt to get to know her like her trio of classmates.

* MortonsFork: What the school had to do when Nonoka's Science Research Club was finally disbanded due to lack of members. They could leave her to her own devices (meaning she'd wander around potentially causing explosions and the like in the course of doing her experiments) or make her join the Mystery Research Club (potentially adding a chemical element to a club already infamous for girls using brute strength to perform 'magic' and carrying around cursed items). Nonoka eventually joins the Mystery Research Club, since at least then all the walking disasters are gathered and contained in one place.

* ObliviousToLove: Daisuke. So much so that on at least two occasions Suzu (easily the most aggressive of the girls interested in him) has actually physically attacked him over it.
** That said, in Chapter 229 ("The Mystery of Boats") he quickly gets flustered when Suzu deliberately sits closely to him and looks up from him from below, accentuating her girlishness.

* ShipperOnDeck: Yui is one for Daisuke and Suzu, partially because she gets along really well with Suzu herself. She isn't even remotely subtle about it, either. For example, in Chapter 229 ("The Mystery of Boats"), she and Suzu plan to ride a rowing boat together but are told they have to be accompanied by an adult. Yui insists Daisuke take Suzu rowing.

* StupidSexyFriend: Reiko insists that she has no romantic feelings for Daisuke, which is completely undercut by the fact that the two have sometimes found themselves in situations where it's blatantly obvious that they have ''some'' sort of attraction to each other.

** Lampshaded in Chapter 178 ("The Mystery of Maid Cafes"). Ryouko recruited Suzu, Chiaki and Kotone to turn Marcott's (the cafe frequented by Daisuke, and where Ryouko works part time) into a maid cafe to try to draw in a younger crowd. The girls give Daisuke stereotypical maid service (e.g. serving him a omurice and then drawing a heart on it) but then the manager asks if the girls would be willing to give that sort of service to someone '''other''' than Daisuke. Ryouko is forced to concede the point.

* RevisitingTheRoots: In Chapter 289, Daisuke lampshades the fact that the series has drifted away from its original premise of him being a guinea pig for the girls' mystery research, in favor of it becoming a generic harem manga. He tries to get them to engage in their old shenanigans, but it's implied that due to character development they care about him too much to return to their old ways.

* ProductionThrowback:

* NotAllowedToGrowUp: The characters have gone through three separate Tanabata holidays (so far), but Kotone sensei, a third-year, has yet to graduate.

* SheCleansUpNicely: Aya Oosumi, the art club president. Simply getting some sleep over summer break is enough to turn her from a shambling zombie witCreepyUndershadowedEyes who constantly coughs up blood to a happy-go-lucky girl with sparkling eyes and a sunny smile.

* ChristmasCake: Hinted at with Asahi-sensei, who on several occasions has mentioned doing things like going on vacation to hot springs or Hawaii alone or gotten upset that the Mystery Research Club got together and had fun without her.

* SlapstickKnowsNoGender: The various girls are as likely to wind up in embarrassing or painful situations as Daisuke, though more often embarrassing than painful.