Student yuri. You can read them separately, but they are somewhat tied together.

1. Senpai and Kouhai (後輩と先輩)
2. That Girl at Cram School (塾のあの子)
3. A Hopeless Romantic Wants to Give Up on Love (恋をやめたい恋愛体質)
4. A Friend's Love (友人の恋)
5. Cheating and Atonement (浮気と償い)
6. The Day I Realized (気付いてしまった日)
7. 500 Times Over (500回繰り返す)