Kuzuresaru Nichijou

1-2. Kuzuresaru Nichijou: Seishori Dougu to Natta Kanojo (崩れ去る日常～性処理道具となった彼女～; Diary of a Downfall: From Girlfriend to Sex Toy)

Kasumi and Takuma have a promise 12 years in the making. Their love is honest and pure, but when something threatens to get them expelled, how far is Kasumi willing to go to prevent it?

3-4. Kouhai JK ga Gimai ni!? Namaiki na Imouto ni Iroiro Wakarasetemita. (後輩JKが義妹に！？生意気な妹に色々わからせてみた。; My New Naughty Stepsister Is Gonna Teach Me!?)

Yuto prefers to be alone, even when Himeno, the hottest student at the academy, has her eyes on him. And with Himeno now his stepsister, how can he say no to such a beauty who wants him?

5. Kyonyuu Papakatsu Musume (巨乳パパ活娘; G-Cup Sugar Baby)

A girl looking for a sugar daddy to help her keep up with the Joneses at her expensive academy ends up being blackmailed into giving away more than she bargained for. But does she have a secret aim?

(Source: Irodori Comics)