Kiy00

some classic buckle-up-cause-it's-a-long-ride bls!
https://www.mangago.me/read-manga/kamisama_no_uroko/
https://www.mangago.me/read-manga/hidamari_ga_kikoeru/
https://www.mangago.me/read-manga/aitsu_no_daihonmei/
https://www.mangago.me/read-manga/koimonogatari/
https://www.mangago.me/read-manga/starting_with_a_lie/ (<-- not manga, but-!)

Have you read the Warui series? All together it adds up to a lot of chapters. You can read them in order just check out here
v01 - Warui Koto Shitai [1-1]
v02 - Warui ko Demo Ii? [1-2]
v03 - Kirai ja nai Kedo [2-1]
v04 - Warui Yatsu Demo Ii [1-3]
v05 - Koi Ja nai Kedo [2-2]
v06 - Mujihi na Otoko [3-1]
v07 - Warui Koibito ja Dame? [1-4]
v08 - Kare ja nai kedo [2-3]
v09 - Mujihi na Anata [3-2]
v10 - Sunao ja nai Kedo [2-4]
v11 - Warui Ouji Demo Suki [1-5]
v12 - Mujihi na Karada [3-3]
v13 - Shouwaru Ookami ga Koi o Shita Rashii [4-1]
v14 - Himitsu ja nai Kedo [2-5]

Alternatively, read them by pairs like with this order;
Mikado x Towa
1 Warui Koto Shitai - I Want to Be Naughty!
2 Warui ko demo ii? - I'm a Bad Kid, but That's Okay Isn't It
3 Warui Yatsu Demo Ii - Is Even a Bad Boy, Good?
4 Warui Koibito ja Dame?- Can a Bad Boy be a Lover?
5 Warui Ouji Demo Suki- I Love a Prince Even If He is Naughty

Shinonome x Yukimura
1 Kirai Ja Nai Kedo - I Don't Dislike You
2 Koi Ja Nai Kedo - Isn't It Love
3 Kare Ja Nai Kedo - I'm Not Your Boyfriend
4 Sunao Ja Nai Kedo - I'm Not Honest
5 Himitsu Ja nai kedo
* Warui Koto Bakkashite Gomennasai : Extra of 2 pairs

Aikawa x Nanao
1 Mujihi Na Otoko - Merciless Man
2 Mujihi Na Anata - Merciless Lover
3 Mujihi Na Karada - Ruthless Body

https://www.mangago.me/read-manga/ashita_wa_docchi_da/
Please try this Author's other books you will find most of them with more than 10+ chapters and they are really really good

Then you haven't come across best and longest Japanese BL-
1- https://www.mangago.me/read-manga/yuuutsu_na_asa/
2- https://www.mangago.me/read-manga/you_re_my_loveprize_in_viewfinder/
3- https://www.mangago.me/read-manga/love_nest_minaduki_yuu/
4- https://www.mangago.me/read-manga/ameiro_paradox/

Omh Thank you so much!! I've been looking through the mangago search filter but it's the worst..

Thanks you!! I've been craving a good long series!! <3

I just checked and it's a school life setting? That's one of my favorite settings thank you so much I love u..

All of them look so good and I love how you recommended different genres. Thank you!! <3

Oh and I've already read starting with a lie I loved it but it kinda frustrated me sometimes because of how dense they were

Your welcome