Nazotoki Yori mo Taihen da

Saki Junjino has the looks, smarts, and athletic skill to be the best girl at Myochi Gakuen, but she also has an unusual fondness for riddles. Eita Ichinose is recruited by Saki to become a member of her riddle-solving club, and he has to figure out her brain-teasers every day after school! Wanting to spend time after-school with the beautiful senior, Eita will solve her riddles again and again... No knowledge or calculation required! You can try it for yourself!

(Source: Young Magazine, translated)