Yahari Ore no Seishun Love Comedy wa Machigatteiru., Yamada-kun to 7-nin no Majo (TV) Recommendations
Both feature delinquent protagonists helping others. Both are harems that are heavier on story and drama than others in the genre. Both deal with similar themes.
At first glance, these shows don't seem particularly similar, but when I was watching Yamada-kun and the Seven Witches, I kept being reminded of Oregairu. I later realized that they were similar in that they both focus on a high school club where a group of people attempt to help other people in the school with their problems (the Service Club in Oregairu obviously did this, and the research on the school's witches done by the Supernatural Studies Club in Yamada-kun led to the club's members helping the witches they found sort out their problems). Overall, while the focus of the shows is different, the
Both anime doesn't seems similar at first but change as the story developed. And these are what i found similar.
-The male protagonist was a loner. Except in oregairu, the protagonist become a loner by self choices while in Yamada-kun because he is a delinquent.
-The female protagonist was avoided by society because being a perfect student.
-There's unusual club activity
-The male protagonist was underestimated but turns out to be reliable.
Also, the school atmosphere felt similar. An elite school where intelligence is everything.
Both Main Characters (Hachiman and Yamada) are similar in the sense that they have similar personalities. Hachiman has his edgy and loner moments, while Yamada is pretty much a delinquent. They both have a mini Harem, with Hachiman having Yukino, Yuigahama, Iroha, etc. whilst Yamada has all the witches.
Both share well written and complex plots. People that were gripped to oregairu can definitely get hooked to this. Both underrated anime.