This is one of 8 Genshaku Tsundere Danshi Anthology books.

From Midnight Scans:

George Asakura "Koibumi Hiyori -Ikarus no Koibitotachi" (A Perfect Day for Love Letters - Icarus Lovers)
- She found the videotapes that her despicable Oniichan left for his girlfriend before he died!

Yoshii Yuu "Raburiiti!" (Lovely Tea)
- He's just someone who works in a pachinko parlor, and no one knows his secret!

Watanabe Ayu "Junjou Hansamu" (Handsome Pure Heart)
- Even though he loves her, he refuses to obey! It’s the love of a tsundere boy!

Yoshioka Ririko "Kare wa Tomodachi Bangaihen" (He's my Boyfriend - Extra Chapter)
- To show from her side, how the "guy with glasses" turned to be Mizuno?!

Ishiko "Natsu, Juuyonsai -Boku no Omoi-" (Summer, 14 years old –My Thought-)
- He's willing to change himself to fit with his girlfriend who is a high school student! It’s about a younger boy’s pure love!

Aoi Mamoru "Kokuhaku Meeru"
- He got an unexpected confession mail. How will she attract the guy without calling him...?