Student yuri. You can read them separately, but they are somewhat tied together.
 
(Source: Pixiv, translated)
 
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. She Repeated This 500 Times (500回繰り返す)

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