Love is close.

1-3. Ichiban Chikaku de Koi wo Suru (Love is Close)
I'm now at an age where it's normal to want to do it. It's just that... I'm still a virgin and I'm jealous of Itsuki, my brother. He's tall, handsome, and popular. However, Itsuki is nothing but a pervert who loves me to the point of stealing my underwear to sniff them! But when one day I joked about him being a good-for-nothing, not even capable of surprising me in my sleep, he staredat me with grave eyes... It sucks, he's serious!

4-5. Shishi mo Kobamazu 2-3 (The Lion Doesn't Refuse)
6. Uso no Youna Hanashi: Bangai (Just Like A Lie: Extra)