Asuko March! is a josei series by Akiyama Kaori from Margaret's YOU magazine and the main character attends a technical high school.
Yuzuko was left alone after her grandmother passed away.
Shadowed by a mysterious organization, her family murdered by a psychopath,
and with the sudden "breakdown" of the world, the missing pieces to everything is revealed,
and the "Peppermint" inside Yuzuko activates...
Dainana Jyoshika Houkou by TSUBANA runs in Comic Ryu and is a comedy where strange stuff happens around the cover girls.
Ateya no Tsubaki by Kanji Kawashita had an 18+ sticker on it since there is sexual imagery in this Edo period horror-mystery, not unusual for Young Animal magazine.
Sakuragawa Volley-boys by Souko Masaki is about pretty boys playing high school volleyball and the otaku girl Satoko who follows them.
Cafe Detective Club by Fujishiro Takeshi was an impulse buy - turns out it's a cute girl comedy. Here's its Gangan Online page.
Popcorn Avatar by Koichiro Hoshino runs in Shonen Sunday. I was drawn to it by the blonde fighter who often wears cheerleader gear.
Prizona 6 by KOJINO & Ryunosuke Kingetsu deals with six females are stranded on an island with no memory of their pasts as part of Project Prisoner.
Le Tour! is a Shonen Sunday series by Akira Otani about a budding competitive cyclist.
I'd seen Kiyoku Masashiku Utsu Kusuku (ufotable x Tartan Check) on the shelf a couple times & the one-shot 364-page is about girl's soccer.
Love Eighteen by Akira Miyagawa can be seen in Kodansha's Afternoon and takes place in 2018 when a supercomputer directed starts chasing main girl Naoki. The not-so-clean character design caught my eye when flipping through an issue of the magazine.
Shoujo Fight by Yoko Nihonbashi focuses on a women's volleyball team and had an anime OVA episode in 2009. Characters have a thin black outline around them.
Ryo Atsuchi's light comedy Sofuteni is about a female "soft tennis" club and will have an anime adaptation later this year.
Here's a Sofuteni trailer from Comiket 79 and you may notice some ecchi moments:
Femme Fatale and Darenimo Ienai, both by Kaya Shigisawa, have a black-haired glasses girl as main lead in relationship drama, though Femme Fatale looks like it has some humor. Also: Femme Fatale has French and Japanese titles for each chapter.
Nightmare Maker by Cuvie had an 18+ sticker and for good reason: a number of sexual scenes that are part of dream/reality blurring for its high school characters.