is there a concrete osoeri origin story? i wanna know ALL of their lore

AHHH YES there is! i have a bunch of aus where they meet in diff ways but there is a series complacent one... i can tell the tale but i always get embarrassed and worry if its cringe when i ramble so i drew some pictures to help give the tldr of it... Long post probably up ahead SO ig it starts in highschool, cringe baby erina crushed on osomatsu, she love that he's soo silly and carefree, because she's anxious and has a forgettable aura she'll pretend to be friends with him in her mind. The crush didnt really go anywhere... they had small interactions that meant a lot to her, but after graduation she didnt see him anymore and it dwindled away

so erina's college years mostly focused on her upping her social skills and fashion sense, turning a full 180 in order to change her image and be liked by lots of people. though she didnt feel a lot of change in her self esteem and problem with loneliness, especially when graduating and not being close with many people to stay in touch

but life goes on and she keeps living and working even though she's bad at being independent and doing adult things. she longs for connection and is ultimately so lonely and epic fail.. at the highschool reunion of The Movie, she shows up late and witnesses NEET village scene happen... finding it very cute and amusing, she gets the idea in her head that if these matsuguys are pathetic losers maybe they would fawn over her like they did for totoko in highschool? she thinks this but really wants to find some connection and friends with people she thinks is on a similar fail wavelength as her. so she stalks them, finding where they hang out and what they like so she can squeeze into their lives forcefully

theres like hanging out and getting to know them bits, but most of the brothers kind of see Erina as like an alien that they can't let their guard down? as much as they like her and fawn over her at first, hanging out doesn't come as easily since she's not totoko and she's not cool and down to earth like kin-chan.. the only one who it comes easy to hanging out with her is osomachu! who doesn't care about how he acts and always puts his worst foot forward, and she likes that about him

and eventually erina gets really insecure about her being really pushy in becoming friends because she'll witness that she's never going to be another totoko who is so strong and beautiful and their childhood friend... she doesn't need to be fawned over but she would like to feel a part of the group too.. it feels really awkward when group interactions start leaving her out.. and she'll feel ignored just like she has all her life

but not everyone forgot she wasn't there ! osomatsu being suprisingly very observant and bold enough to go after her makes her feel seen again- and things happen like getting closer and spending exclusive time with each other only, a lot of friends to lovers mutual pining tropes, they eventually date and become lovey dovey!

so thats like the 'origins'... sorry if it's not that exciting but thgey are so silly to me ^__^ it comes full circle to not being noticed -> noticed